Apollo 15 Astronaut Al Worden has Passed Away

Apollo Astronaut Alfred Worden (1932-2020). Credit: NASA

Last Wednesday (March 18th), the world was saddened to hear of the death of Apollo astronaut Alfred “Al” Worden, who passed away after suffering a stroke at an assisted living facility in Texas. A former Colonel in the US Marine Corps who obtained his Bachelor of Science from West Point Academy in 1955 and his Master of Science at the University of Michigan in 1963, Worden went on to join NASA.

Continue reading “Apollo 15 Astronaut Al Worden has Passed Away”

What Does The Apollo 11 Moon Landing Site Look Like Today?

The Apollo 11 landing site imaged by the Lunar Reconnaissance Orbiter's camera in 2012. Visible is the LM (lunar module), Lunar Laser Ranging RetroReflector (LRRR), its discarded cover and the Passive Seismic Experiment Package (PSEP). The image was taken from 15 miles (24 kilometers) above the surface. Credit: NASA/GSFC/Arizona State University

Forty-five years ago yesterday, the Sea of Tranquility saw a brief flurry of activity when Neil Armstrong and Buzz Aldrin dared to disturb the ancient lunar dust. Now the site has lain quiet, untouched, for almost half a century. Are any traces of the astronauts still visible?

The answer is yes! Look at the picture above of the site taken in 2012, two years ago. Because erosion is a very gradual process on the moon — it generally takes millions of years for meteors and the sun’s activity to weather features away — the footprints of the Apollo 11 crew have a semi-immortality. That’s also true of the other five crews that made it to the moon’s surface.

In honor of the big anniversary, here are a few of NASA’s Lunar Reconnaissance Orbiter’s pictures of the landing sites of Apollo 11, Apollo 12, Apollo 14, Apollo 15, Apollo 16 and Apollo 17. (Apollo 13 was slated to land on the moon, but that was called off after an explosion in its service module.)

The Apollo 12 and Surveyor 3 landing sites in the Ocean of Storms on the moon. Visible is the descent stage of Intrepid (the lunar module) and the robotic craft Surveyor 3, which the astronauts took a sample from while they were on the surface. Also labelled are craters the astronauts visited. Credit: NASA/Goddard/Arizona State University
The Apollo 12 and Surveyor 3 landing sites in the Ocean of Storms on the moon. Visible is the descent stage of Intrepid (the lunar module) and the robotic craft Surveyor 3, which the astronauts took a sample from while they were on the surface. Also labelled are craters the astronauts visited. Credit: NASA/Goddard/Arizona State University

The Apollo 14 landing site imaged by the Lunar Reconnaissance Orbiter in 2011. At right is the descent stage of Antares, the lunar module. At far left, beside the cart tracks and marked by an arrow, is the Apollo Lunar Surface Experiment Package. Credit: NASA/GSFC/Arizona State University
The Apollo 14 landing site at Fra Mauro, imaged by the Lunar Reconnaissance Orbiter in 2011. At right is the descent stage of Antares, the lunar module. At far left, beside the cart tracks and marked by an arrow, is the Apollo Lunar Surface Experiment Package. Credit: NASA/GSFC/Arizona State University

The Apollo 15 landing site at Hadley plains, taken by the Lunar Reconnaissance Orbiter from an altitude of 15.5 miles (25 kilometers) in 2012. Visible is the descent stage of Falcon (the lunar module), the Lunar Roving Vehicle (LRV) and the Apollo Lunar Surface Experiment Package (ALSEP). The site is marked by rover tracks. Credit: NASA Goddard/Arizona State University
The Apollo 15 landing site at Hadley plains, taken by the Lunar Reconnaissance Orbiter from an altitude of 15.5 miles (25 kilometers) in 2012. Visible is the descent stage of Falcon (the lunar module), the Lunar Roving Vehicle (LRV) and the Apollo Lunar Surface Experiment Package (ALSEP). The site is marked by rover tracks. Credit: NASA Goddard/Arizona State University

The Apollo 16 landing site in the Descartes Highlands, taken by the Lunar Reconnaissance Orbiter in 2010. Visible is the descent stage of Orion, the lunar module (LM), the "parking spot" of the Lunar Roving Vehicle (LRV), the Apollo Lunar Science Experiment Package (ALSEP), a radioisotope generator (RTG) and the geophone line, which is part of the mission's Active Seismic Experiment. Credit: NASA's Goddard Space Flight Center/Arizona State University
The Apollo 16 landing site in the Descartes Highlands, taken by the Lunar Reconnaissance Orbiter in 2010. Visible is the descent stage of lunar module (LM) Orion, the “parking spot” of the Lunar Roving Vehicle (LRV) and its tracks, the Apollo Lunar Science Experiment Package (ALSEP), a radioisotope generator (RTG) and the geophone line, which is part of the mission’s Active Seismic Experiment. Credit: NASA’s Goddard Space Flight Center/Arizona State University

The Apollo 17 landing site at Taurus-Littrow taken by the Lunar Reconnaissance Orbiter in 2011. Visible is the descent stage of the lunar module Challenger, the Lunar Roving Vehicle (LRV) and its tracks, the Apollo Lunar Surface Experiment Package (ALSEP) and Geophone Rock. Credit: NASA's Goddard Space Flight Center/ASU
The Apollo 17 landing site at Taurus-Littrow taken by the Lunar Reconnaissance Orbiter in 2011. Visible is the descent stage of the lunar module Challenger, the Lunar Roving Vehicle (LRV) and its tracks, the Apollo Lunar Surface Experiment Package (ALSEP) and Geophone Rock. Credit: NASA’s Goddard Space Flight Center/ASU

Carnival of Space #357

Carnival of Space. Image by Jason Major.
Carnival of Space. Image by Jason Major.

Welcome, come in to the 357th Carnival of Space! The carnival is a community of space science and astronomy writers and bloggers, who submit their best work each week for your benefit. I’m Susie Murph, part of the team at Universe Today and now, on to this week’s stories!

We’re going to start off with a double blast from the past, courtesy of CosmoQuest! This week, they’re featuring Stuart Robbins’s blog post from January 13, 2012, titled “Perspective on the Apollo 15 Landing Site.” He explores the region of the Moon that is the current home of the MoonMappers images that YOU are still mapping and exploring today – the Apollo 15 landing site area. It’s a neat place and we can study a lot of things there. Due to a quirk of optics and angles, you can even imagine you’re flying towards it.

Next, we stay with Cosmoquest’s Moon Mappers as they highlight the interesting discovery that the groundbreaking Soviet Lunakhod 2 lunar rover traveled farther than earlier estimated on it’s mission in 1972. Visit MoonMappers at Cosmoquest for more great stories!

Moving through history, we travel over to io9’s Space blog for a history of the American Space Shuttle disasters is a grim reminder of the danger of space travel. Just released is Major Malfunction, a documentary on the two Shuttle catastrophes. Major malfunction is an understatement for the destruction of Space Shuttle Challenger moments after launch in 1986, and the loss of Space Shuttle Columbia during re-entry in 2003.

Next at io9, we visit Mars to view the magnificent Draa, which are ancient landforms created from waves of sand. Check out the article and it’s images here.

We also have another article from io9, which new astronaut Reid Wiseman recounts his first adventurous days in space.

Now we’ll jump over for some gorgeous views from the Chandra X-Ray Observatory! One of their new images is a glorious view of the Whirlpool spiral galaxy which radiates with fantastic points of x-ray light. These image is breath-taking!

Want more gorgeous images? Visit Brownspaceman.com to see his discussion of the Tulip Nebula, which is a composite image which also maps the emissions from this incredible nebula.

Next, we head over to the Meridani Journalfor coverage of a major find in the search for exoplanets. A new world which is more than twice as large as Earth and about 17 times heavier has been discovered, a sort of “mega-Earth” as some have referred to it.

The NextBigFuture Blog lives up to it’s name by bringing us two interesting stories from Elon Musk and his company SpaceX. First, he points out that the key is reusability. Musk said the crewed Dragon is designed to land softly back on Earth and be rapidly turned around for another flight — possibly on the same day. Spacex is aiming for 10 flights without any significant refurbishment for the Dragon v2. The thing that will have to be refurbished is the main heat shield. Further improved heat shield materials [later versions of PICA-X] would mean Spacex could aim for 100 reusable flights.

We then head over to the Urban Astronomer, where recent observations of a very near pair of brown dwarf objects has led to something new: We’re watching the weather on stars themselves!

Finally, we return to Universe Today for some interesting potential missions. First, the B612 Foundation’s privately-funded Sentinel mission, once launched and placed in orbit around the Sun in 2018, will hunt for near-Earth asteroids down to about 140 meters in size using the most advanced infrared imaging technology, without government red tape to hamper the mission. Next, the NASA Innovative Advanced Concepts office announced a dozen far-flung drawing-board proposals that have received $100,000 in Phase 1 funding for the next 9-12 months, one of which is a balloon for exploring Titan. We’re looking forward to hearing about these projects and many others in the coming years.

That’s it for this week’s Carnival! See you all next time!

And if you’re interested in looking back, here’s an archive to all the past Carnivals of Space. If you’ve got a space-related blog, you should really join the carnival. Just email an entry to [email protected], and the next host will link to it. It will help get awareness out there about your writing, help you meet others in the space community – and community is what blogging is all about. And if you really want to help out, sign up to be a host. Send an email to the above address.

Watch All The Apollo Saturn V Rockets Blast Off At The Same Time

Screenshot of a video showing all the Saturn V launches happening at the same time. Credit: SpaceOperaFR/YouTube (screenshot)

Editor’s note: We posted this yesterday only to find that the original video we used had been pulled. Now, we’ve reposted the article with a new and improved version of the video, thanks to Spacecraft Films.

To the moon! The goal people most remember from the Apollo program was setting foot on the surface of our closest neighbor. To get there required a heck of a lot of firepower, bundled in the Saturn V rocket. The video above gives you the unique treat of watching each rocket launch at the same time.

Some notes on the rockets you see:

  • Apollos 4 and 6 were uncrewed test flights.
  • Apollo 9 was an Earth-orbit flight to (principally) test the lunar module.
  • Apollo 8 and 10 were both flights around the moon (with no lunar landing).
  • Apollo 13 was originally scheduled to land on the moon but famously experienced a dangerous explosion that forced the astronauts to come back to Earth early — but safely.
  • Apollos 11, 12, 14, 15, 16 and 17 safely made it to the moon’s surface and back.
  • Skylab’s launch was also uncrewed; the Saturn V was used in this case to send a space station into Earth’s orbit that was used by three crews in the 1970s.
  • You don’t see Apollo 7 pictured here because it did not use the Saturn V rocket; it instead used the Saturn IB. It was an Earth-orbiting flight and the first successful manned one of the Apollo program. (Apollo 1 was the first scheduled crew, but the three men died in a launch pad fire.)

And if this isn’t enough firepower for you, how about all 135 space shuttle launches at the same time?

Read more about the Saturn V at NASA and the Smithsonian National Air and Space Museum.

(h/t Sploid)

All Saturn V Launches At Once from Spacecraft Films on Vimeo.

Apollo 15: “Stand by for a Hard Impact”

Only two of three parachutes worked correctly for the return of Apollo 15. Credit: NASA.

On this day in history, the crew of Apollo 15 returned home from their mission to the Moon. But the splashdown in the Pacific Ocean wasn’t without a little drama. One of the three parachutes failed to open fully, but astronauts Dave Scott, Al Worden, and Jim Irwin didn’t know it until they were almost ready to hit the ocean.

“Apollo 15, this is Okinawa. You have a streamed chute. Stand by for a hard impact.”

(You can read the entire transcript here.)

The recovery ship, USS Okinawa radioed to the crew that one parachute was not inflated. Technically, the Apollo capsule really only needed two chutes to land, with the third being for redundancy, but still, the landing was harder than other Apollo missions. However, no damage or injury resulted.

Experts looking at this photo say that two or three of the six riser legs on the failed parachute were missing, and after looking into the issue, it was determined that excess fuel burning from the Command Module Reaction Control System likely caused the lines to break.

Apollo 15 landed about about 320 miles (515 kilometers) north of Hawaii.

Weekly SkyWatcher’s Forecast: October 1-7, 2012

Greetings, fellow SkyWatchers! Normally we don’t pay much attention to the waning Moon, but this week will be a bit different. Why not enjoy some alternative studies by viewing familiar features in a different light?! Of course, we might just pick up a galaxy or catch a snowball! When you’re ready, just meet me in the back yard…

Monday, October 1 – In 1897, the world’s largest refractor (40?) debuted at the dedication of the University of Chicago’s Yerkes Observatory. The immense telescope was 64 feet long and weighed 6 tons. Also today in 1958, NASA was established by an act of Congress. More? In 1962, the 300 foot radio telescope of the National Radio Astronomy Observatory (NRAO) went live at Green Bank, West Virginia. It held its place as the world’s second largest radio scope until it collapsed in 1988. (It was rebuilt as a 100 meter dish in 2000.) Although first light for the 40? was Jupiter, E. E. Barnard later discovered the third companion star to Vega using the Yerkes refractor and first “light” studies at Green Bank were a radio source galaxy and pulsar for NRAO.

Tonight let’s begin our adventures by talking about Luna 9, also known as Lunik 9. In 1966, the unmanned Soviet lunar probe became the first to achieve a soft landing on the Moon’s surface and successfully transmit photographs back to Earth. The lander weighed in at 99 kg, and the four petals, which formed the spacecraft, opened outward. Within five minutes of landing, antennae sprang to life and the television cameras began broadcasting back the first panoramic images of the surface of another world, proving that a landing would not simply sink into the lunar dust. Last contact with the spacecraft occurred just before midnight on February 6, 1966.

Tonight you can view the area of the first successful landing on the Moon by turning your binoculars or telescopes copes towards the Oceanus Procellarum—the Ocean of Storms. While the area will be brightly lit and it will be difficult to pick out small features, Procellarum is the long, dark expanse that runs from lunar north to south. On its western edge, you can easily identify the dark oval of landmark crater Grimaldi. About one Grimaldi-length northward and on the western shore of Procellarum is where you would find the remains of Luna 9.

Tuesday, October 2 – Tonight before the skies get bright we’ll a have look at an incredible southern galaxy in Sculptor – NGC 253 (Right Ascension: 0 : 47.6 – Declination: -25 : 17).

Located about one third the way between Alpha Sculptor and Beta Ceti, NGC 253 was discovered by Caroline Herschel in 1783 during a comet search. As the brightest member of the “Sculptor Group”, this large and beautiful galaxy is also one of the closest outside our “Local Group” and will be readily apparent in binoculars for southern observers. Mid-to-large telescopes will be delighted with its many bright knots and dark obscured areas. For more northern observers, wait until the constellation is at its highest to catch a glimpse of this awesome 7th magnitude southern study.

Now, let’s wait for the Moon to rise!

For a telescope challenge, continue south to relocate previous study Petavius on the southern terminator. Just beyond its east wall, look for a bright ridge that extends from north to south separated by darkness from Petavius. This is Palitzsch, a very strange, gorge-like formation that looks as if it was caused by a meteor plowing through the Moon’s surface. Palitzsch’s true nature wasn’t known until 1954 when Patrick Moore resolved it as a “crater chain” using the 25″ Newall refractor at Cambridge University Observatory. While you’re admiring Petavius and its branching rima, keep in mind this 80 kilometer long crack is a buckle in the lava flow across the crater floor. Now look along the terminator for the long, dark runnel which is often considered to be the Petavius Wall but is actually the fascinating crater Palitzsch. This 41 kilometer wide crater is confluent with a 110 kilometer long valley that is outstanding at this phase!

Wednesday, October 3 – Tonight let’s go hunting for the “Blue Snowball”. It’s proper name is the NGC 7662 (Right Ascension: 23 : 25.9 – Declination: +42 : 33) and you find it around five degrees due east of Omicron Andromedae. At magnitude 9, this one challenges binocular users and presents the same problems as locating the M57 – low power will show you something – but not what it is. In a telescope, the “Blue Snowball” is almost as large as the “Ring” nebula.

Are you ready for the Moon to rise? Then let’s continue our waning studies…

As Mare Crisium slowly disappears into the shadows, let’s take a look for a lunar challenge crater – Macrobius. You’ll find it just northwest of the Crisium shore. Spanning 64 kilometers in diameter, this Class I impact crater drops to a depth of nearly 3600 meters – about the same as many of our earthly mines. Its central peak rises back up, and at 1100 meters may be visible as a small speck inside the crater’s interior. Power up and look at how steep its crater slopes are. Can you spot the smaller impact crater Macrobius O to the southeast and conjoining crater Tisserand to the east? Check out how the sunlight highlights the the west and southwest walls. In this particular light you can see how high and terraced they really are! Look for the impact of Macrobius C to the southwest.

In binoculars, look for the junction of Mare Fecunditatis and the edge of Mare Tranquillitatis. Here stands ancient Taruntius. Like a “lighthouse” guarding the shores, it stands on a mountainous peninsula overlooking the mare and shooting its brilliant beams across the desolate landscape nearly 175 kilometers.. Tonight it appears as a bright ring, but watch in the days ahead as it turns into just another crater.

Thursday, October 4 – Today in 1957, the USSR’s Sputnik 1 made space history as it became the first manmade object to orbit the earth. The Earth’s first artificial satellite was tiny, roughly the size of a basketball, and weighed no more than the average man. Every 98 minutes it swung around Earth in its elliptical orbit and changed everything. It was the beginning of the “Space Race.” Many of us old enough to remember Sputnik’s grand passes will also recall just how inspiring it was. Take the time with your children or grandchildren to check heavens-above.com for visible passes of the ISS and think about how much our world has changed in just 50 years!

Tonight we’re headed towards the southwest corner star of the Great Square of Pegasus – Alpha. Our goal will be 11th magnitude NGC 7479 located about 3 degrees south (RA 23:04.9 Dec +12:19).

Discovered by Sir William Herschel in 1784 and cataloged as H I.55, this barred spiral galaxy can be spotted in average telescopes and comes to beautiful life with larger aperture. Also known as Caldwell 44 on Sir Patrick Moore’s observing list, what makes this galaxy special is its delicate “S” shape. Smaller scopes will easily see the central bar structure of this 105 million light-year distant island universe, and as aperture increases, the western arm will become more dominant. This arm itself is a wonderful mystery – containing more mass than it should and a turbulent structure. It is believed that perhaps a minor merger may have at one time occurred, yet no evidence of a companion galaxy can be found.

On July 27, 1990, a supernova occurred near NGC 7479?s nucleus and reached a magnitude of 16. When observed in the radio band, there is a polarized jet near the bright nucleus that is unlike any other structure known. If at first you do not see a great deal of detail, relax… Allow your mind and eye time to look carefully. Even with telescopes as small as 8-10? structure can easily be seen. The central bar becomes “clumpy” and this well-studied Seyfert region is home to an abundance of molecular gas and forming stars.

Enjoy this incredible galaxy…

Friday, October 5 – Today marks the birthdate of Robert Goddard. Born 1882, Goddard is known as the father of modern rocketry – and with good reason.

In 1907, Goddard came into the public eye as a cloud of smoke erupted from the basement of the physics building in Worcester Polytechnic Institute where he had just fired a powder rocket. By 1914, he had patented the use of liquid rocket fuel and two- or three-stage solid fuel rockets. His work continued as he sought methods of putting equipment ever higher, and by 1920 he had envisioned his rockets reaching the Moon. Among his many achievements, he proved that a rocket would work in a vacuum, and by 1926 the first scientific equipment went along for the ride. By 1932, Goddard was guiding those flights and by 1937 had the motors pivoting on gimbals and controlled gyroscopically. His lifetime of work went pretty much unnoticed until the dawn of the Space Age, but in 1959 (14 years after his death) he received his acclaim at last as NASA’s Goddard Space Flight Center was established in his memory.

Today in 1923, Edwin Hubble was also busy as he discovered the first Cepheid variable in M31 – the Andromeda Galaxy. Hubble’s discovery was crucial in proving that objects once classed as “spiral nebulae” were actually independent and external stellar systems like our own Milky Way.

Tonight let’s look at a Cepheid variable as we head towards Eta Aquilae, almost a fistwidth due south of bright Altair.

Discovered by Edward Pigott in 1784, Eta is a Cepheid variable star around 1200 light-years away, but its beauty can be followed easily with the unaided eye. Ranging almost a full magnitude in a period of slightly over 7 days, this yellow supergiant is 3000 times brighter than our own Sun and around 60 times larger. Watch over the days as it takes about 48 hours to achieve maximum brightness and rivals nearby Beta – then falls slowly over the next 5 days.

If you’re still out when the Moon rises, look for a conjunction with the bright planet, Jupiter! For a handful of viewers in the south-western regions of Australia, this is the universal date of an occultation event, so be sure to check resources for websites like IOTA, which will give you précises times and locations for your area.

Saturday, October 6 – Have you been watching planetary motion? On this universal date, Mars leaves the constellation of Libra and enters Scorpius. For observers in the southern hemisphere, look for a conjunction of Mercury and Saturn at dusk. While time and the stars appear to stand still and astronomical twilight begins earlier each night, let’s take one last look at Antares. It’s a relatively old, massive star – very bright and destined to end brilliantly. Or Markab – an aging blue dwarf soon to become a red giant. Now look at Deneb. It’s a supermassive blue giant shining as brightly as some globular clusters – yet fated to create another supernova remnant in Cygnus within 100 thousand years… Take a look at Enif – a spectral class K orange supergiant radiating with as much light as 7000 suns – yet it burns fast and is cooler than Sol. How about Polaris? Hotter than Sol, it’s another star about to enter a glorious retirement. Thankfully, our Sun is right in the middle of the wonderful H-R diagram!

Now wait for the Moon to rise…

Tonight it is possible to see another landing area – that of Apollo 15. Locate previous northern study crater Plato and look due south past the isolated Spitzbergen Mountains to comparably-sized Archimedes. Spend a few moments enjoying Archimedes’ well-etched terraced walls and textured bright floor. Then look east look for the twin punctuations of Aristillus and the more northern Autolycus. South of Aristillus note the heart-shape of Paulus Putredinus. There you will see Mons Hadley very well highlighted and alone on its northeastern bank. Power up to see that the Mons Hadley area includes a cove known as the Hadley Delta, and there on that plain just north of the brilliant mountain peak is where Apollo 15 touched down. Enjoy it in sunset hues!

Your first challenge for the evening will be a telescopic one known as the Hadley Rille. Using our past knowledge of Mare Serenitatis, look for the break along its western shoreline that divides the Caucasus and Apennine mountain ranges. Just south of this break is the bright peak of Mons Hadley. You’ll find this area of highest interest for several reasons, so power up as much as possible.

Impressive Mons Hadley measures about 24 by 48 kilometers at its base and reaches up an incredible 4572 meters. If this mountain was indeed caused by volcanic activity on the lunar surface, this would make it comparable to some of the very highest volcanically caused peaks on Earth, such as Mount Shasta or Mount Rainer. To its south is the secondary peak Mons Hadley Delta—the home of the Apollo 15 landing site just a breath north of where it extends into the cove created by Palus Putredinus.

Along this ridgeline and smooth floor, look for a major fault line known as the Hadley Rille, winding its way across 120 kilometers of lunar surface. In places, the rille spans 1500 meters in width and drops to a depth of 300 meters below the surface. Believed to have been formed by volcanic activity some 3.3 billion years ago, we can see the impact that lower gravity has had on this type of formation, since earthly lava channels are less than 10 kilometers long and only around 100 meters wide. During the Apollo 15 mission, Hadley Rille was visited at a point where it was only 1.6 kilometers wide—still a considerable distance as seen in respect to astronaut James Irwin and the lunar rover. Over a period of time, its lava may have continued to flow through this area, yet it remains forever buried beneath years of regolith.

Sunday, October 7 – Today celebrates the birthday of Niels Bohr. Born 1885, Bohr was a pioneer Danish atomic physicist. Why not get up early – or stay up late – to enjoy more waning Moon studies?

Journey south of landmark Eratosthenes for an area known as Sinus Aestuum – the “Bay of Billows”. Its very smooth floor is curiously riddled to the north and east by dark stains. At one time Sinus Aestuum may have been completely submerged in basaltic lava across its 290 kilometer expanse. Later the molten rock sank to the Moon’s interior before it could do much more than melt away outer layers and older surface features. However, recent studies have shown mixing in the dark mantle terrain, as well as some areas which are spectrally different – dominated by what could be crystallized beads.

While at lower powers Sinus Aestuum seems to have very little to keep your interest, try magnifying and really take a look. Just to the southwest of Eratosthenes are the wonderful ruins of crater Stadius. This one is a real ghost! Stadius was form in the lower Imbrian period, so it’s not really that old, but the lava flow of Mare Insularum has pretty much taken it over. Very little remains that can be measured of its wall, but there are enough to throw some shadows to the northeast, and you can see the vague outline of companion crater Stadius A to the west. Look for all kinds of little craterlets dotting the floor; especially resolvable is Stadius K to the south and Stadius L, which appears lengthened to the southwest.

While you travel across the plains of Sinus Aestuum, look for the Rimae Bode and area which may be lighter because it contains a mixing of volcanic glasses and black beads. Crater Bode is nothing more than the tiny dark well along the eastern shore! The long rille in the center has no name, but if the shadows allow you to follow it south, you will end in several lava dome regions that belong to crater Gambart. This is just north of the Fra Mauro region and also home to the Surveyor 2 landing area! Just a bit more south will bring you to Fra Mauro and – as craters go – 3.9 billion year old Fra Mauro is on the shallow side and spans 95 kilometers. At some 730 meters deep, standing at the foot of one of its walls would be like standing at the bottom of the Grand Canyon… Yet, time has so eroded this crater that its west wall is completely missing and its floor is covered with fissures. Even though ruined Fra Mauro seems like a forbidding place to land a manned mission, it remained high on the priority list because it is geologically rich. Ill-fated Apollo 13 was to land in a formation north of the crater which was formed by ejecta belonging to the Imbrium Basin – material which had already been mapped telescopically. By returning samples of this material from deep within the Moon’s crust, scientists would have been able to determine the exact time these changes came about. As you view Fra Mauro tonight, picture yourself in a lunar rover traversing this barren landscape and viewing the rocks thrown out from a long-ago impact. How willing would you be to take on the vision of others and travel to another world?

Until next week? Ask for the Moon, but keep on reaching for the stars!

Lunar Image Courtesy of Mike Romine.

Look, It’s a Moon Buggy! LRO’s Best Look Ever at the Apollo 15 Landing Site

Apollo 15 landing site imaged from an altitude of 25 km, allowing the highest resolution view from orbit. The Lunar Roving Vehicle (LRV) is parked to the far right, and the Lunar Module descent stage is in the center, LRV tracks indicated with arrows. Credit: NASA/GSFC/Arizona State University.


A new image from the Lunar Reconnaissance Orbiter’s Narrow Angle Camera provides the most detailed orbital look ever at the Apollo 15 landing site on the Moon. The image of the Hadley plains shows the hardware left behind by astronauts Dave Scott and Jim Irwin and the tracks from the lunar rover.

“We like to look at the Apollo landing site images because it’s fun,” said LRO principal investigator Mark Robinson said at a briefing last year on LRO images. And these latest images are really fun, as look how clearly the lunar lander and the ‘Moon buggy’ show up! (Click images for larger views.) Additionally, we can basically follow all the movements of the rover and the astronauts during their 67-hour stay on the Moon’s surface in August of 1971.

See below for a traverse map of their rover travels.

Apollo 15 traverse routes sketched on an image from LRO. Visible is Hadley Rille. Credit: NASA/GSFC/Arizona State University.

Apollo 15 was the first mission to have the Lunar Rover, which allowed the astronauts to traverse far from the Lunar Module and explore much more local geology than the astronauts on the previous missions (Apollo 11, 12, 14).

“Not only did the LRV allow the astronauts to move from place-to-place at a lively rate of eight to sixteen kilometers per hour (five to ten miles per hour), but the LRV also allowed brief periods of rest that in turn helped to conserve oxygen,” said Robinson on the LROC website.

The goals of Apollo 15 were to sample the basalts in the region, search for ancient crustal rocks and explore a lunar rille for the first time – the long, narrow depressions in the lunar surface that resemble channels. Additionally, Scott and Irwin deployed the third Apollo Lunar Surface Experiments Package (ALSEP), which consisted of several experiments that were powered by a Radioisotope Thermoelectric Generator (RTG) and sent back valuable scientific data to the Earth for over six years after the astronauts left.

Details showing Apollo 15 LRV tracks, see traverse map above for locations. Credit: NASA/GSFC/Arizona State University.

Robinson and his team can figure out the details of what pieces of equipment are in each location by comparing what they see in orbital images to images taken from the surface by the astronauts.

One of the most commonly asked questions is if the flags left on the Moon are still visible.

“All we can really see is the spots where the flag was planted because the astronauts tramped down the regolith,” Robinson said last year. “I’m not sure if the flags still exist, given the extreme heat and cold cycle and the harsh UV environment. The flags were made of nylon, and personally I would be surprised if anything was left of them since it has been over 40 years since they were left on the Moon and the flags we have here on Earth fade after they are left outside for one summer. If the flags are still there they are probably in pretty rough shape.”

For two one-month periods last year (2011), the LRO orbit was lowered such that overflights of the Apollo sites were only 25 to 30 kilometers, rather than the usual 50 kilometers. These low passes resulted in NAC pixel scales near 25 centimeters, Robinson said. “LRO has a ground speed of a bit over 1600 meters (5249 feet) per second, and the shortest NAC exposure time is 0.34 millseconds, so images taken from this low altitude are smeared down track a bit. However, the smear is hardly noticeable and features at the Apollo sites definitely come into sharper focus. In this new low-altitude NAC image of the LRV, tracks are visible about half of the time, usually when the tracks are at an angle to the Sun direction, rather than parallel,” he said.

You can see the close-up images of the Apollo 12, 14 and 17 at a previous article on Universe Today.

Source: LROC website