Ganymede Casts a Long Shadow Across the Surface of Jupiter

NASA’s Juno spacecraft captured this view of Jupiter during the mission’s 40th close pass by the giant planet on Feb. 25, 2022. The large, dark shadow on the left side of the image was cast by Jupiter’s moon Ganymede. Image data: NASA/JPL-Caltech/SwRI/MSSS Image processing by Thomas Thomopoulos

What is that large dark smudge on Jupiter’s side? It may remind you of a certain scene from the sci-fi film “2010: The Year We Make Contact,” where a growing black spot appears in Jupiter’s atmosphere.

But this is a real photo, and the dark spot is just an elongated shadow of Ganymede, Jupiter’s largest moon. Just like when Earth’s Moon crosses between our planet and the Sun creating an eclipse for lucky Earthlings, when Jupiter’s moons cross between the gas giant and the Sun, they create shadows too.  

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This Incredible Photo of the Sun is Made up of 150,000 Individual Photographs

A 300 megapixel photo of our Sun, taken by using a specially modified telescope, compiling over 150,000 individual images. Credit and copyright: Andrew McCarthy.

You’re looking at a 300-megapixel photo of our Sun. Astrophotographer Andrew McCarthy used a specially modified telescope, taking over 150,000 individual photos and combing them into this magnificent image.

“It took about 10 hours to stack all the data, and another 3-4 hours to get it from a raw stack to the final image,” McCarthy said via email.

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Stare Straight Down Into a Giant Storm on Jupiter

A view from the Juno spacecraft of a giant storm on Jupiter. Credit: NASA/JPL-Caltech/SwRI/MSSS/Kevin M. Gill

A new batch of images recently arrived at Earth from JunoCam, the visible light camera on board the Juno spacecraft at Jupiter. The camera has provided stunning views of the gas giant world since the spacecraft’s arrival in 2016. Citizen scientists and imaging enthusiasts act as the camera’s virtual imaging team, participating in key steps of the process by making suggestions of areas on Jupiter to take pictures and doing the image editing work.

This lead image, edited by Kevin Gill, is another stunner: a look straight down into a giant storm.

And we like Kevin’s attitude about this whole process:

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Perseverance’s Landing Seen in Full Color, Thanks to Citizen Science

Incoming! Mars 2020 - Lander Vision System Camera shows the view of Jezero Crater from above. Colorized. Credit: NASA/JPL-Caltech/MSSS/Kevin M. Gill

A month on, we’re all still buzzing about the Perseverance rover’s perfect landing in Jezero Crater on Mars, back on February 18, 2021. Over the past few weeks, NASA has released more stunning imagery and footage of the landing, and since then the world-wide cadre of citizen scientists and image editing enthusiasts have been springing into action to enhance and augment all the incredible scenes captured by Perseverance’s collection of high-resolution cameras.

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Astronomers find 100 brown dwarfs in our neighborhood

An artist's conception of a brown dwarf. A new study identifies CK Vulpeculae as the remnant of a collison between a brown dwarf and a white dwarf. Image: By NASA/JPL-Caltech (http://planetquest.jpl.nasa.gov/image/114) [Public domain], via Wikimedia Commons
An artist's conception of a brown dwarf. Brown dwarfs are more massive than Jupiter but less massive than the smallest main sequence stars. Image: By NASA/JPL-Caltech (http://planetquest.jpl.nasa.gov/image/114) [Public domain], via Wikimedia Commons

Brown dwarfs are smallish objects sitting somewhere between stars and planets, making them notoriously hard to find. But a recent citizen science project aimed at finding the elusive Planet 9 has instead revealed a treasure trove of these oddities, right next door.

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Five Space and Astronomy Activities to do at Home During the Coronavirus Outbreak

We’re in uncharted territory as the world faces the Coronavirus (COVID-19) pandemic. While the medical community is on the front lines of dealing with this, as well as others who provide critical services in our communities, the best thing many of us can do is to stay home (and wash our hands).

If you’re looking for ways to keep occupied, keep your kids in learning-mode while school is canceled, and expand your horizons — all at the same time — luckily there are lots of space and astronomy-related activities you can do at home and online. We’ve compiled a few of our favorites, including this first one, one that just became available yesterday.

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Hubble is the Ultimate Multitasker: Discovering Asteroids While it’s Doing Other Observations

Some asteroids from within our Solar System have photobombed deep images of the Universe taken by the NASA/ESA Hubble Space Telescope. These asteroids reside, on average, only about 260 million kilometres from Earth — right around the corner in astronomical terms. Yet they've horned their way into this picture of thousands of galaxies scattered across space and time at inconceivably farther distances. This Hubble photo of a random patch of sky is part of the Frontier Fields survey. The colourful image contains thousands of galaxies, including massive yellowish ellipticals and majestic blue spirals. Much smaller, fragmentary blue galaxies are sprinkled throughout the field. The reddest objects are most likely the farthest galaxies, whose light has been stretched into the red part of the spectrum by the expansion of space. Intruding across the picture are asteroid trails that appear as curved or S-shaped streaks. Rather than leaving one long trail, the asteroids appear in multiple Hubble exposures that have been combined into one image. Of the 20 total asteroid sightings for this field, seven are unique objects. Of these seven asteroids, only two were earlier identified. The others were too faint to be seen previously. The trails look curved due to an observational effect called parallax. As Hubble orbits around Earth, an asteroid will appear to move along an arc with respect to the vastly more distant background stars and galaxies. The motion of Earth around the Sun, and the motion of the asteroids along their orbits, are other contributing factors to the apparent skewing of asteroid paths. All the asteroids were found manually, the majority by "blinking" consecutive exposures to capture apparent asteroid motion. Astronomers found a unique asteroid for every 10 to 20 hours of exposure time. The Frontier Fields program is a collaboration among several space telescopes and ground-based observatories to study six massive galaxy clusters and their effects. Using a diff

It looks like a poster of the famous Hubble Deep Field, marked with white streaks by a child, or put away carelessly and scratched in the process. But it’s not. The white streaks aren’t accidents; they’re the paths of asteroids.

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Jupiter or Earth? Which One’s Which, and Why Do They Look so Similar?

Though Jupiter and Earth are wildly differing places, some things are the same on both worlds. Image Credit: NASA
Though Jupiter and Earth are wildly differing places, some things are the same on both worlds. Image Credit: NASA

Jupiter: a massive, lifeless gas giant out there on the other side of the asteroid belt. It’s a behemoth, containing 2.5 times as much mass as all the other planets combined. To top it off, it’s named after the Roman God of War.

Earth: a tiny rocky world, almost too close to the Sun, where life rises and falls, punctuated repeatedly by extinctions. Compared to Jupiter, it’s a gum-drop world: Jupiter is 317.8 times the mass of Earth. And Earth is named after a goddess in German paganism, or so we think.

“Out of all the complexity flows beauty…”

Norman Kuring, NASA’s Goddard Space Flight Center.

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Hey Citizen Scientists! Help NASA Analyze Images Taken from the Space Station

Astronaut Karen Nyberg looks out at Earth from the International Space Station's Cupola. You can too! Credit: NASA.

Calling all citizen scientists, geography buffs, fans of the International Space Station and those who love that orbital perspective!

CosmoQuest has a brand new project in coordination with NASA and the Astronomical Society of the Pacific (ASP) where you can help identify features in photographs taken by astronauts from the space station.

The project is called Image Detective. I’ve tried it out, and wow, THIS is a lot of fun!

Now, I absolutely love seeing the images taken of Earth from the ISS, and I routinely follow all the astronauts on board on social media so I can see their latest images. And I also love the concept of regular, everyday people doing science. Plus I’m a big fan of CosmoQuest and their ‘quest’ to bring science to the public.

But still, the setup CosmoQuest has is really great and the process is easy. Citizen scientists are asked to help identify geographic features (natural or human-made) and then determine the location on Earth where the photo is centered.

I found that last part to be the most difficult, but I’ve been known to have trouble reading a map … so I’m hoping that I can improve a bit with more practice.

“The astronauts’ photos of Earth are visually stunning, but more than that, they can be used to study our changing Earth,” said our good friend Dr. Pamela Gay, who is the Director of Technology and Citizen Science at ASP. “From erupting volcanoes, to seasonal flooding, these images document the gradual changes that happen to our landscape. The trick is, we need to make these images searchable, and that means taking the time to sort through, analyze, and label (add metadata) the unidentified images within the database of 1.5 million plus photos.”

You can try it out here: http://cosmoquest.org/ImageDetective.

The team says that Image Detective spreads the significant work necessary to label all of the images out to citizen scientists across the world.

“This is a unique, powerful, and beautiful image data set that has already yielded excellent research science. But the data set needs the many eyes and minds of citizen scientists to reach its full potential as a publicly available, searchable catalog,” said Dr. Jennifer Grier, a Senior Scientist and Senior Education and Communication Specialist at Planetary Science Institute (PSI) and CosmoQuest’s lead support scientist. “With the additions that citizen scientists as detectives can make, professional research scientists will be able to conduct more research into our changing world, and do so much more effectively.”