“Great Barrier Reef Near Whitsunday Islands” was uploaded to Flickr

An astronaut aboard the International Space Station used a powerful lens to photograph these three reefs in Australia’s Great Barrier Reef on Oct. 12, 2015. Reefs are easy to spot from space because the iridescent blues of shallow lagoons contrast sharply with the dark blues of deep water. via NASA ift.tt/1P1a2Iu
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Great Barrier Reef Near Whitsunday Islands was taken on October 11, 2015 at 10:24PM

“Scott Kelly's Post-Flight Visit to Washington” was uploaded to Flickr

Former NASA astronaut Scott Kelly speaks about his historic mission aboard the International Space Station during an event at the United States Capitol Visitor Center, Wednesday, May 25, 2016, in Washington. via NASA ift.tt/1sfuKiW
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Scott Kelly's Post-Flight Visit to Washington was taken on May 25, 2016 at 03:02PM

“Chasma Boreale and North Polar Ice Cap of Mars” was uploaded to Flickr

Mars has bright polar caps of ice that are easily visible from telescopes on Earth. A seasonal cover of carbon-dioxide ice and snow is observed to advance and retreat over the poles during the Martian year. Scientists using radar data have found a record of the most recent Martian ice age recorded in the north polar ice cap. via NASA ift.tt/1sdb3bv
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Chasma Boreale and North Polar Ice Cap of Mars was taken on May 25, 2016 at 08:32AM

“NASA's OSIRIS-REx Spacecraft Prepared for Mission to an Asteroid” was uploaded to Flickr

NASA's OSIRIS-REx spacecraft is revealed after its protective cover is removed inside the Payload Hazardous Servicing Facility at Kennedy Space Center, on May 21, 2016. OSIRIS-REx, targeted for a Sept. 8 launch, will be the first U.S. mission to sample an asteroid, retrieve at least two ounces of surface material and return it to Earth for study. via NASA ift.tt/1OWSkLu
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NASA's OSIRIS-REx Spacecraft Prepared for Mission to an Asteroid was taken on May 21, 2016 at 07:37AM

“Fjord and Glacier in East-Central Greenland” was uploaded to Flickr

On May 19, 2016, NASA's IceBridge, an airborne survey of polar ice, crossed Greenland to fly central glacier flowlines in the east-central region of the country. This photo captures the fjord of Violin Glacier, with Nord Glacier at the upper left corner. This is IceBridge's eighth spring campaign of science flights over Arctic sea and land. via NASA ift.tt/1s7jaq6
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Fjord and Glacier in East-Central Greenland was taken on May 19, 2016 at 05:31AM

“Up and Over” was uploaded to Flickr

Cassini orbited in Saturn's ring plane -- around the planet's equator -- for most of 2015. via NASA ift.tt/1WcJKuB
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Up and Over was taken on May 23, 2016 at 02:53AM

“CubeSats Deployed From the International Space Station” was uploaded to Flickr

CubeSats fly free after leaving the NanoRacks CubeSat Deployer on the International Space Station on May 17, 2016. Seen here are two Dove satellites. The satellites are part of a constellation designed, built and operated by Planet Labs Inc. to take images of Earth from space. via NASA ift.tt/27I2gi7
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CubeSats Deployed From the International Space Station was taken on May 17, 2016 at 04:45AM

“May 19, 2000, Early Morning Liftoff of Atlantis on STS-101 Mission” was uploaded to Flickr

Flames from the solid rocket boosters lit up the clouds of smoke and steam trailing behind shuttle Atlantis on May 19, 2000, as it lifted off on mission STS-101. It was the shuttle program's third space station assembly flight, and first space flight for astronaut Jeff Williams, currently aboard the station as a member of the Expedition 47 crew. via NASA ift.tt/20aXPa5
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May 19, 2000, Early Morning Liftoff of Atlantis on STS-101 Mission was taken on October 15, 2009 at 11:33AM

“Water Etchings in Western Mexico Sands” was uploaded to Flickr

Expedition 47 Flight Engineer Tim Kopra of NASA posted this May 15, 2016 photograph to social media, writing, "Water etchings in western @Mexico sands. @Space_Station #Explore" via NASA ift.tt/1rTZdCW
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Water Etchings in Western Mexico Sands was taken on May 18, 2016 at 05:11AM

“Stargazing From the International Space Station” was uploaded to Flickr

Astronauts aboard the International Space Station (ISS) see the world at night on every orbit — that’s 16 times each crew day. An astronaut took this broad, short-lens photograph of Earth’s night lights while looking out over the remote reaches of the central equatorial Pacific Ocean. via NASA ift.tt/1rRGKHd
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Stargazing From the International Space Station was taken on May 17, 2016 at 04:27AM

“Celebrating Ten Years of NASA's Consolidated Space Communications Program” was uploaded to Flickr

This photograph shows NASA’s newest Deep Space Network antenna, Deep Space Station 35 (DSS-35) in Canberra, Australia. The Deep Space Network is managed by the Space Communications and Navigation (SCaN) program office, created on May 16, 2006. via NASA ift.tt/27setrc
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Celebrating Ten Years of NASA's Consolidated Space Communications Program was taken on May 16, 2016 at 06:20AM

“Hubble Spies a Spiral Snowflake” was uploaded to Flickr

Together with irregular galaxies, spiral galaxies make up approximately 60 percent of the galaxies in the local universe. However, despite their prevalence, each spiral galaxy is unique — like snowflakes, no two are alike. This is demonstrated by the striking face-on spiral galaxy NGC 6814. via NASA ift.tt/1TKk7dX
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Hubble Spies a Spiral Snowflake was taken on May 09, 2016 at 02:00AM

“NASA's IceBridge Flies Over the Front of a Greenland Glacier” was uploaded to Flickr

Operation IceBridge, NASA's airborne survey of polar ice, has returned from the Umanaq B mission along Greenland's western coast. This top-down view from a NOAA P-3 aircraft shows the calving front of Sermeq Kujatdleq glacier. The Naircraft's #2 lower engine nacelle and left main landing gear fairing is in the foreground at top. via NASA ift.tt/220Oins
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NASA's IceBridge Flies Over the Front of a Greenland Glacier was taken on May 12, 2016 at 05:01AM

“Full of Science, Dragon Spacecraft Undocks for Return to Earth” was uploaded to Flickr

ESA astronaut Tim Peake photographed the SpaceX Dragon cargo craft as it undocked from the International Space Station on May 11, 2016. Scheduled to splashdown in the Pacific Ocean at 2:55 p.m. EDT, the spacecraft will return the final batch of human research samples from former NASA astronaut Scott Kelly’s historic one-year mission. via NASA ift.tt/1XlmJov
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Full of Science, Dragon Spacecraft Undocks for Return to Earth was taken on May 11, 2016 at 07:09AM

“Smoke From Canadian Wildfires Trapped in Clouds” was uploaded to Flickr

NASA's Aqua satellite captured this image of the clouds over Canada on May 9, 2016. Entwined within the clouds is the smoke billowing up from the wildfires that are currently burning across a large expanse of the country. via NASA ift.tt/1WniUAg
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Smoke From Canadian Wildfires Trapped in Clouds was taken on May 10, 2016 at 04:33AM

“Mercury Solar Transit” was uploaded to Flickr

The planet Mercury is seen in silhouette, lower third of image, as it transits across the face of the sun Monday, May 9, 2016, as viewed from Boyertown, Pennsylvania. Mercury passes between Earth and the sun only about 13 times a century, with the previous transit taking place in 2006. via NASA ift.tt/1T6P1TE
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Mercury Solar Transit was taken on May 09, 2016 at 05:07AM

“Hubble Spies the Barred Spiral Galaxy NGC 4394” was uploaded to Flickr

Shown in this Hubble Space Telescope image, NGC 4394 is the archetypal barred spiral galaxy, with bright spiral arms emerging from the ends of a bar that cuts through the galaxy’s central bulge. These arms are peppered with young blue stars, dark filaments of cosmic dust, and bright, fuzzy regions of active star formation. via NASA ift.tt/1rZSvvv
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Hubble Spies the Barred Spiral Galaxy NGC 4394 was taken on May 02, 2016 at 02:00AM

“May 5, 1961, Alan Shepard in Spacesuit Before Mercury Launch” was uploaded to Flickr

Astronaut Alan B. Shepard Jr., in his silver pressure suit with the helmet visor closed, prepares for his Mercury Redstone 3 launch on May 5, 1961. Shepard's Freedom 7 Mercury capsule lifted off at 9:34 a.m. and flew a suborbital trajectory lasting 15 minutes and 22 seconds. He became the first American to fly into space. via NASA ift.tt/24ukJja
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May 5, 1961, Alan Shepard in Spacesuit Before Mercury Launch was taken on May 04, 1961 at 07:00PM

“Many Fantastic Colors” was uploaded to Flickr

The Nili Fossae region, located on the northwest rim of Isidis impact basin, is one of the most colorful regions of Mars. This region is ancient and has had a complicated geologic history, leading to interesting structures like layered bedrock, as well as other compositions. via NASA ift.tt/1W7TdTm
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Many Fantastic Colors was taken on April 18, 2016 at 01:02PM

“Space Station Flyover of Morocco” was uploaded to Flickr

Expedition 47 Flight Engineer Jeff Williams of NASA captured this detailed photograph from the International Space Station during a daytime flyover of Morocco on May 2, 2016. Williams shared the image to social media and asked, "Reptile scales, or incredible and rugged geology in Morocco?" via NASA ift.tt/1SWtCto
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Space Station Flyover of Morocco was taken on May 03, 2016 at 05:16AM

“The Dew Drop of Saturn” was uploaded to Flickr

The water-world Enceladus appears here to sit atop Saturn's rings like a drop of dew upon a leaf. Even though it appears like a tiny drop before the might of the giant Saturn, Enceladus reminds us that even small worlds hold mysteries and wonders to be explored. via NASA ift.tt/1SGdNb7
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The Dew Drop of Saturn was taken on May 02, 2016 at 02:59AM