“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