NASA officials, fellow astronauts and the family of Sally Ride gathered in Houston at the Johnson Space Center on Sept. 18, 2012. They remembered Ride’s life and the legend she leaves behind. An oak tree — one of most enduring types of trees — was planted and dedicated in Ride’s honor. It sits among 62 other trees dedicated to astronauts and space pioneers in a grove located JSC.
Ride passed away on July 23, 2012 after a courageous 17-month battle with pancreatic cancer. “She lived her life to the fullest, with boundless energy, curiosity, intelligence, passion, commitment, and love. Her integrity was absolute; her spirit was immeasurable; her approach to life was fearless,” wrote the team at Sally Ride Science — the science education company Ride founded — on the day of her death.
As our closest neighbor in space, a time-capsule of planetary evolution and the only world outside of Earth that humans have stepped foot on, the Moon is an obvious and ever-present location for future exploration by humans. The research that can be done on the Moon — as well as from it — will be invaluable to science. But the only times humans have visited the Moon were during quick, dusty jaunts on its surface, lasting only 2-3 days each before departing. Long-term human exposure to the lunar environment has never been studied in depth, and it’s quite possible that — in addition to the many inherent dangers of living and working in space — the Moon itself may be toxic to humans.
An international team of researchers has attempted to quantify the health dangers of the Moon — or at least its dust-filled regolith. In a paper titled “Toxicity of Lunar Dust” (D. Linnarsson et al.) the health hazards of the Moon’s fine, powdery dust — which plagued Apollo astronauts both in and out of their suits — are investigated in detail (or as best as they can be without actually being on the Moon with the ability to collect pristine samples.)
Within their research the team, which included physiologists, pharmacologists, radiologists and toxicologists from 5 countries, investigated some of the following potential health hazards of lunar dust:
Inhalation. By far the most harmful effects of lunar dust would come from inhalation of the particulates. Even though lunar explorers would be wearing protective gear, suit-bound dust can easily make its way back into living and working areas — as Apollo astronauts quickly discovered. Once inside the lungs the super-fine, sharp-edged lunar dust could cause a slew of health issues, affecting the respiratory and cardiovascular system and causing anything from airway inflammation to increased risks of various cancers. Like pollutants encountered on Earth, such as asbestos and volcanic ash, lunar dust particles are small enough to penetrate deep within lung tissues, and may be made even more dangerous by their long-term exposure to proton and UV radiation. In addition, the research suggests a microgravity environment may only serve to ease the transportation of dust particles throughout the lungs.
Skin Damage. Lunar regolith has been found to be very sharp-edged, mainly because it hasn’t undergone the same kind of erosive processes that soil on Earth has. Lunar soil particles are sometimes even coated in a glassy shell, the result of rock vaporization by meteorite impacts. Even the finer particles of dust — which constitute about 20% of returned lunar soil samples — are rather sharp, and as such pose a risk of skin irritation in instances of exposure. Of particular note by the research team is abrasive damage to the outer layer of skin at sites of “anatomical prominence”, i.e., fingers, knuckles, elbows, knees, etc.
“The dust was so abrasive that it actually wore through three layers of Kevlar-like material on Jack [Schmitt’s] boot.”
– Professor Larry Taylor, Director of the Planetary Geosciences Institute, University of Tennessee (2008)
Eye Damage. Needless to say, if particles can pose abrasive damage to human skin, similar danger to the eyes is also a concern. Whether lunar dust makes its way into the eye via airborne movement (again, much more of a concern in microgravity) or through direct contact from fingers or another dust-coated object, the result is the same: danger of abrasion. Having a scratched cornea is no fun, but if you’re busy working on the Moon at the time it could turn into a real emergency.
While the research behind the paper used data about airborne pollutants known to exist on Earth and simulated lunar dust particles, actual lunar dust is harder to test. The samples returned by the Apollo missions have not been kept in a true lunar-like environment — being removed from exposure to radiation and not stored in a vacuum, for instance — and as such may not accurately exhibit the properties of actual dust as it would be encountered on the Moon. The researchers conclude that only studies conducted on-site will fill the gaps in our knowledge of lunar dust toxicity. Still, the research is a step in the right direction as it looks to ensure a safe environment for future explorers on the Moon, our familiar — yet still alien — satellite world.
“The Apollo astronauts reported undesirable effects affecting the skin, eyes and airways that could be related to exposure to the dust that had adhered to their space suits during their extravehicular activities and was subsequently brought into their spacecraft.”
– Dag Linnarsson, lead author, Toxicity of Lunar Dust
Top image: Apollo 16 astronaut Charlie Duke with a dust-coated LRV. Side image: a dusty Gene Cernan in the LM at the end of an Apollo 17 EVA. (NASA/JSC)
Some lucky sixth-, seventh- and eigth-graders at the O. Henry Middle School in Austin, Texas got the chance to chat with Expedition 30 astronauts Dan Burbank, Don Pettit and Andre Kuipers aboard the International Space Station today, getting answers to their questions about life in orbit. The video was shared by NASA TV shortly after. Enjoy!
Microgravity — or “zero-g” as it’s sometimes called — is not a natural state for the human body to live in for prolonged periods of time. But that is what today’s astronauts are often expected to do, whether while on expedition aboard Space Station or during a future voyage to the Moon or Mars. A host of physical issues can result from the space environment, from bone loss and muscle atrophy to the risks associated from increased exposure to radiation.
Now, there’s another downside to long-term life in orbit: eye and brain damage.
A team of radiologists led by Dr. Larry A. Kramer from The University of Texas Medical School at Houston performed MRIs on 27 astronauts, measuring in each the shape and thickness of the rear of the eyes, optic nerve, optic nerve sheath and pituitary gland.
In 7 of the 27 astronauts flattening of the backs of the eyes was noted, and enlargement of the optic nerve was detected in nearly all of them — 26 out of 27.
In addition, four exhibited deformation of the pituitary gland.
The optic nerve. (NIH)
The changes to the eyes and optic nerves are similar to what are typically seen in those suffering from idiopathic intracranial hypertension (IIH), a disorder characterized by increased pressure within the skull. Symptoms typically include headache, dizziness and nausea, and if left untreated it can produce permanent vision loss through optic nerve damage.
“The MRI findings revealed various combinations of abnormalities following both short- and long-term cumulative exposure to microgravity also seen with idiopathic intracranial hypertension,” said Dr. Kramer. “Microgravity-induced intracranial hypertension represents a hypothetical risk factor and a potential limitation to long-duration space travel.”
Chief of flight medicine at NASA’s Johnson Space Center, Dr. William J. Tarver, noted that although no astronaut has been kept from flight duties as a result of such risks, NASA will continue to “closely monitor the situation” and has placed the potential danger “high on its list of human risks.”
The team’s paper was accepted into the journal Radiology on Feb. 1.
“Orbital and Intracranial Effects of Microgravity: Findings at 3-T MR Imaging.” Collaborating with Dr. Kramer were Ashot Sargsyan, M.D., Khader M. Hasan, Ph.D., James D. Polk, D.O., and Douglas R. Hamilton, M.D., Ph.D.
Update Oct. 24, 2013: Further investigation by researchers at Houston Methodist and Johnson Space Center have shown more evidence of long-term eye damage after just two weeks in orbit. Read more.
Please take the time to respectfully recognize the passing of veteran astronaut, Janice Voss. She was a former science director for a NASA exoplanet-hunting spacecraft and also a member of five manned spaceflights. She lost her battle with cancer today at the young age of 55. “Just got the very sad news that U.S. astronaut Janice Voss passed away last night,” the Association of Space Explorers, an international organization representing more than 350 individuals who have flown in space, wrote on Facebook. “Our thoughts go out to her family and friends.” NASA confirmed Voss’ passing in a statement issued on Tuesday (Feb. 7), saying she had passed away overnight.
Janice was born on October 8, 1956, in South Bend, Indiana, but she called Rockford, Illinois home. Some of her passions for life included flying, volleyball, dancing and reading science fiction. She graduated from from Minnechaug Regional High School, Wilbraham, Massachusetts, in 1972, continued on to Purdue University for her bachelor of science degree and achieved a master of science degree in electrical engineering and a doctorate in aeronautics/astronautics from the Massachusetts Institute of Technology in 1977 and 1987, respectively. From there, Janice continued her education by taking some correspondence courses from the University of Oklahoma and did some graduate work in space physics at Rice University in 1977 and 1978.
Astronaut Janice Voss pictured in 2000 on the flight deck of the space shuttle Endeavour during the STS-99 mission. (NASA)In 1990, Janice Voss was chosen by NASA for the astronaut corps and served as a mission specialist on five space shuttle missions, including the only repeat flight in the program’s 30 year history. But that’s not all. She also flew with the first commercial lab, rendezvoused with Russia’s Mir space station and helped create the most complete digital topographic map of the Earth. In June 1993, Janice took part in biomedical and material science experiments as a member of the Spacehab module – a commercial laboratory attached to the orbiter’s payload bay. In February 2000, Voss again launched on Endeavour as part of the Shuttle Radar Topography Mission crew. After deploying a nearly 200-foot (60-meter) mast, Voss and her team labored through two full shifts to map more than 47 million square miles (122 million square kilometers) of the Earth’s land surface. The shuttle Endeavour served as both her first and final mission.
The first time a space shuttle came close to the Russian Space Station, Mir, Dr. Voss was there. As her second mission, she and her STS-63 crew mates met with the Russians to discuss flight techniques, communications, sensors aids and navigation. The February 1995 “Near-Mir” mission set the stage for the first shuttle-Mir docking later that year. Janice also served on another historic mission – the only time a crew was launched twice to perform the same mission. The first launch came on April 4, 1997 and three days later it returned to Earth after a fuel cell problem. Ninty days later, the Columbia was restored and it launched again into a successful 15 day flight. This time Voss and crew engaged their time inside a European Spacelab module, conducting experiments as part of the Microgravity Science Laboratory (MSL) mission.
Janice Voss, shown in April 1997 working with communications systems on the aft flight deck of space shuttle Columbia. (NASA)Over her career, astronaut Janice Voss totaled over 49 days in space, traveling 18.8 million miles (30.3 million km) while circling the Earth 779 times. Her five missions tied her with the record for the most spaceflights by a woman. When she at last touched down on Earth, she went on to the Johnson Space Center in Houston, Texas to NASA’s Ames Research Center at Moffett Field, California, where she headed the science program for the agency’s Kepler space observatory. She stayed at Ames until 2007 and spent the rest of her time as the payload lead in the astronaut office’s space station branch at the Johnson Space Center.
Janice Voss, pictured looking over a checklist on space shuttle Endeavour's aft flight deck during her final spaceflight. (NASA)“As payload commander of two shuttle missions, Janice was responsible for paving the way for experiments that we now perform on a daily basis on the International Space Station,” chief astronaut Peggy Whitson said in a statement. “By improving the way scientists are able to analyze their data, and establishing the experimental methods and hardware necessary to perform these unique experiments, Janice and her crew ensured that our space station would be the site of discoveries that we haven’t even imagined.”
“During the last few years, Janice continued to lead our office’s efforts to provide the best possible procedures to crews operating experiments on the station today,” she said. “Even more than Janice’s professional contributions, we will miss her positive outlook on the world and her determination to make all things better.”
Solar flares, coronal mass ejections, high-energy photons, cosmic rays… space is full of various forms of radiation that a human wouldn’t want to be exposed to for very long. Energized particles traveling into and through the body can cause a host of nasty health problems, from low blood count to radiation sickness to cataracts and cancer… and potentially even death. Luckily Earth’s magnetic field and atmosphere protects us on the surface from much of this radiation, but what about the astronauts aboard the Space Station? How could events such as today’s powerful near-X-class solar flare and last week’s CME affect them, orbiting 240 miles above Earth’s surface?
Surprisingly, they are safer than you might think.
M8.7-class solar flare erupting on the Sun's northeastern hemisphere at 03:49 UT on Jan. 23, 2012. (Courtesy NASA/SDO and the AIA team. Edited by J. Major.)
The M8.7-class flare that erupted from the Sun early on Jan. 23 sent a huge wave of high-energy protons Earthward, creating the largest solar storm seen since 2005. The cloud of energetic particles raced outwards through the Sun’s atmosphere at speeds well over a million miles per hour, blowing past our planet later the same day. (More slower-moving charged particles will impact the magnetosphere in the coming days.) We are safe on Earth but astronauts exposed to such radiation could have faced serious health risks. Fortunately, most solar protons cannot pass through the hull of the Space Station and so as long as the astronauts stay inside, they are safe.
Of course, this is not the case with more dangerous cosmic rays.
According to the NASA Science site:
Cosmic rays are super-charged subatomic particles coming mainly from outside our solar system. Sources include exploding stars, black holes and other characters that dwarf the sun in violence. Unlike solar protons, which are relatively easy to stop with materials such as aluminum or plastic, cosmic rays cannot be completely stopped by any known shielding technology.
Even inside their ships, astronauts are exposed to a slow drizzle of cosmic rays coming right through the hull. The particles penetrate flesh, damaging tissue at the microscopic level. One possible side-effect is broken DNA, which can, over the course of time, cause cancer, cataracts and other maladies.
In a nutshell, cosmic rays are bad. Especially in large, long-term doses.
Now the astronauts aboard the ISS are still well within Earth’s protective magnetic field and so are shielded from much of the cosmic radiation that passes through our solar system daily. And, strangely enough, when solar flares occur – such as today’s – the amount of cosmic radiation the ISS encounters actually decreases.
Why?
The solar particles push them away.
Decrease in cosmic radiation during a CME recorded in 2005.
In an effect known as the “Forbush decrease”, magnetically-charged particles ejected from the Sun during flares and CMEs reduce the amount of cosmic radiation the ISS experiences, basically because they “sweep away” other charged particles of more cosmic origin.
Because cosmic rays can easily penetrate the Station’s hull, and solar protons are much less able to, the irony is that astronauts are actually a degree safer during solar storms than they would be otherwise.
And it’s not just in low-Earth orbit, either: Wherever CMEs go, cosmic rays are deflected. Forbush decreases have been observed on Earth and in Earth orbit onboard Mir and the ISS. The Pioneer 10 and 11 and Voyager 1 and 2 spacecraft have experienced them, too, beyond the orbit of Neptune. (via NASA Science.)
Due to this unexpected side effect of solar activity it’s quite possible that future manned missions to the Moon, Mars, an asteroid, etc. would be scheduled during a period of solar maximum, like the one we are in the middle of right now. The added protection from cosmic rays would be a big benefit for long-duration missions since we really don’t know all the effects that cosmic radiation may have on the human body. We simply haven’t been traveling in space long enough. But the less exposure to radiation, the better it is for astronauts.
[/caption]
We’re testing a new “Ask” article format here at Universe Today and we know you’ve got a question you’d like to ask Alan Stern!
Here’s how it works: Readers can submit questions they would like Universe Today to ask the guest responder. Simply post your question in the comments section of this article. We’ll take the top five (or so) questions, as ranked by “likes” on the discussion posts. If you see a question you think is good, click the “like” button to give it a vote.
Keep in mind that final question acceptance is based on the discretion of Universe Today and in some cases, the responder and/or their employer.
Our inaugural launch (pun intended) will feature Dr. Alan Stern, principal investigator for NASA’s “New Horizons” mission to Pluto.
Stern is a planetary scientist and an author who has published more than 175 technical papers and 40 popular articles. His research has focused on studies of our solar system’s Kuiper belt and Oort cloud, comets, satellites of the outer planets, Pluto and the search for evidence of solar systems around other stars. He has worked on spacecraft rendezvous theory, terrestrial polar mesospheric clouds, galactic astrophysics and studies of tenuous satellite atmospheres, including the atmosphere of the Moon.
Stern has a long association with NASA, serving the agency’s Associate Administrator for the Science Mission Directorate from 2007-2008; he was on the NASA Advisory Council and was the principal investigator on a number of planetary and lunar missions, including his current stint with the New Horizons Pluto-Kuiper Belt mission. He was the principal investigator of the Southwest Ultraviolet Imaging System, which flew on two space shuttle missions, STS-85 in 1997 and STS-93 in 1999.
He has been a guest observer on numerous NASA satellite observatories, including the International Ultraviolet Explorer, the Hubble Space Telescope, the International Infrared Observer and the Extreme Ultraviolet Observer.
Stern holds bachelor’s degrees in physics and astronomy and master’s degrees in aerospace engineering and planetary atmospheres from the University of Texas, Austin. In 1989, Stern earned a doctorate in astrophysics and planetary science from the University of Colorado at Boulder.
Aside from being the Principal Investigator for NASA’s “New Horizons” mission to Pluto, Currently Stern is the Associate Vice President of R&D – Space Science and Engineering Division at the Southwest Research Institute and recently was appointed director of the Florida Space Institute at Kennedy Space Center.
For those of you who are fans of Pluto, Dr. Stern went on the record against the IAU’s decision in 2006, stating “It’s an awful definition; it’s sloppy science and it would never pass peer review..”
Before submitting your question, take a minute and read a bit more about Dr. Stern at: Dr. Alan Stern
We’ll take questions until 4:00PM (MST) Tuesday December 20th and provide a follow up article with Dr. Stern’s responses to your questions.
What more can we say? This hilarious compilation of astronauts falling on the Moon put together by Joe Ivy comes from actual footage from the Apollo missions. Awesome.
We’ve all seen the specially made NASA van that takes the astronauts to the launchpad, but normally we don’t get to see what it is like on the inside. NASA just put out this video, letting us Earth-bound folks get a peek inside the shiny, silvery astronaut vehicle. And just take a look who got to drive it…
NASA is looking for applicants for its next class of astronaut candidates who will support long-duration missions to the International Space Station and future deep space exploration activities.
“We hope to have a lot of interest and applications so we can have a great class in 2013,” Duane Ross of the NASA Astronaut Selection Office told Universe Today. “This is a pretty fun job.”
So, do you have the right stuff to be an astronaut in today’s changing space environment?
NASA says that a bachelor’s degree in engineering, science or math and three years of relevant professional experience are required in order to be considered. Typically, successful applicants have significant qualifications in engineering or science, or extensive experience flying high-performance jet-aircraft.
“For scientists, engineers and other professionals who have always dreamed of experiencing spaceflight, this is an exciting time to join the astronaut corps,” said Janet Kavandi, director of flight crew operations at the Johnson Space Center in Houston. “This next class will support missions to the station and will arrive via transportation systems now in development. They also will have the opportunity to participate in NASA’s continuing exploration programs that will include missions beyond low Earth orbit.”
Ross said that this upcoming class will be rather small. “The last class of 2009 we had nine NASA folks and they were joined by five international partner astronauts. I think our goal would be something in the eight to twelve range. The actual number doesn’t get decided until we know better what our requirements are and what our loses have been.”
So, how will these astronauts be trained, since the space shuttle is no longer flying and future astronauts may be flying on spacecraft that haven’t been built yet?
“For the last class we picked we actually picked them to be long duration crew members for space station. They didn’t train for the space shuttle and that is exactly what we are going to do with this class,” Ross said. “The new class will train for learning the International Space Station systems, the Russian language, spacewalk and robotics training, and several other disciplines and other things that will come online such as the MultiPurpose Crew Vehicle. For the things that mature downstream, there will be training for those when the time is right but right now we are going to concentrate on the space station.”
After applicant interviews and evaluations, NASA expects to announce the final selections in 2013, and training to begin that August.
NASA will begin accepting applications in November 2011. Additional information about the Astronaut Candidate Program is available by calling the Astronaut Selection Office at 281-483-5907.
