This image from NASA’s Mars Reconnaissance Orbiter (MRO) shows streaks forming on slopes when dust cascades downhill. via NASA http://ift.tt/2EcMFBx

The European Space Agency’s Columbus module celebrates 10 years of science on the International Space Station. via NASA http://ift.tt/2nJ2424

NASA astronaut Robert Curbeam works on the International Space Station’s S1 truss during the space shuttle Discovery’s STS-116 mission in Dec. 2006. via NASA http://ift.tt/2BHlv4a

Lunar crater is named after former NASA chief exploration scientist. via NASA http://ift.tt/2GN1wAh

Taken from inside Chamber A at the Johnson Space Center in September 2017, this image shows the James Webb Space Telescope as it was undergoing cryogenic testing and the temperature was approximately -369.7 degrees Fahrenheit. via NASA http://ift.tt/2BNJqu1

Dr. Lonnie Reid had a long and storied career at NASA’s Glenn Research Center. His expertise in the internal flow of advance aerospace propulsion system was nationally recognized and he was influential in recruiting and mentoring the next generation of scientists and engineers. via NASA http://ift.tt/2E7noYk

The International Space Station, with a crew of six onboard, is seen in silhouette as it transits the moon at roughly five miles per second on Tuesday, Jan. 30, 2018. via NASA http://ift.tt/2DRQEDi

Astronaut Mark Vande Hei took this image of the eastern U.S. and Canada at night, writing, “Good night from @Space_Station. DC, NY, Toronto, Cleveland, and surrounding areas!” via NASA http://ift.tt/2BDVLRC

Layers, probably sedimentary in origin, have undergone extensive erosion in this image from NASA’s Mars Reconnaissance Orbiter (MRO) of Shalbatana Valles, a prominent channel that cuts through Xanthe Terra. via NASA http://ift.tt/2DWtLh3

On Tuesday, Jan. 23, 2018, spacewalker Mark Vande Hei snapped his own portrait, better known as a “space-selfie,” during the first spacewalk of the year. via NASA http://ift.tt/2ngOe66