“Different Worlds” was uploaded to Flickr

Although Tethys and Janus both orbit Saturn and are both made of more or less the same materials, they are very different worlds. via NASA ift.tt/1RftqBR
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Different Worlds was taken on February 26, 2016 at 11:05AM

“Hubble's Blue Bubble” was uploaded to Flickr

The distinctive blue bubble appearing to encircle WR 31a is a Wolf–Rayet nebula — an interstellar cloud of dust, hydrogen, helium and other gases. Created when speedy stellar winds interact with the outer layers of hydrogen ejected by Wolf–Rayet stars, these nebulae are frequently ring-shaped or spherical. via NASA ift.tt/1oEvGez
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Hubble's Blue Bubble was taken on February 22, 2016 at 01:00AM

“Mathematician Katherine Johnson at Work” was uploaded to Flickr

NASA research mathematician Katherine Johnson is photographed at her desk at Langley Research Center in 1966. Johnson made critical technical contributions during her career of 33 years, which included calculating the trajectory of the 1961 flight of Alan Shepard. She was awarded the Presidential Medal of Freedom on Nov. 24, 2015. via NASA ift.tt/1QgSqsn
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Mathematician Katherine Johnson at Work was taken on December 03, 2015 at 06:51AM

“Flying Through the Aurora's Green Fog” was uploaded to Flickr

Expedition 46 crew member Tim Peake of the European Space Agency (ESA) shared a stunning image of a glowing aurora taken on Feb. 23, 2016, from the International Space Station. Peake wrote, "The @Space_Station just passed straight through a thick green fog of #aurora…eerie but very beautiful. #Principia" via NASA ift.tt/1Qyiuyk
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Flying Through the Aurora's Green Fog was taken on February 23, 2016 at 12:58PM

“The Ice Fields of Patagonia” was uploaded to Flickr

This image, acquired by the Operational Land Imager (OLI) on Landsat 8, shows the glaciers of Sierra de Sangra on Jan. 14, 2015. Snow and ice are blue in these false-color images, which use different wavelengths to better differentiate areas of ice, rock, and vegetation. via NASA ift.tt/1T4g2qg
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The Ice Fields of Patagonia was taken on February 18, 2016 at 10:37AM

“Three Times the Fun” was uploaded to Flickr

Three of Saturn's moons -- Tethys, Enceladus and Mimas -- are captured in this group photo from NASA's Cassini spacecraft. via NASA ift.tt/1PSmkVP
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Three Times the Fun was taken on February 22, 2016 at 02:07AM

“Jarosite in the Noctis Labyrinthus Region of Mars” was uploaded to Flickr

This image, acquired on Nov. 24, 2015 by the High Resolution Imaging Science Experiment (HiRISE) camera aboard NASA's Mars Reconnaissance Orbiter, shows the western side of an elongated pit depression in the eastern Noctis Labyrinthus region of Mars. Along the pit's upper wall is a light-toned layered deposit. via NASA ift.tt/1VsgGvb
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Jarosite in the Noctis Labyrinthus Region of Mars was taken on February 19, 2016 at 03:29AM