The International Space Station is seen in this twenty-second exposure as it flies over the Washington National Cathedral, Wednesday, Nov. 29, 2017. Onboard are: NASA astronauts Joe Acaba, Mark Vande Hei, and Randy Bresnik; Russian cosmonauts Alexander Misurkin and Sergey Ryanzansky; and ESA astronaut Paolo Nespoli. http://www.nasa.gov/sites/default/files/thumbnails/image/26956023999_14c62dec79_o.jpg

The Hubble Space Telescope peers into the distant universe to reveal a galaxy cluster called Abell 2537. http://www.nasa.gov/sites/default/files/thumbnails/image/potw1748a.jpeg

The International Space Station is seen in silhouette as it transits the Moon at roughly five miles per second, Dec. 2, 2017, in Manchester Township, York County, Pennsylvania. Onboard are NASA astronauts Joe Acaba, Mark Vande Hei, and Randy Bresnik; Russian cosmonauts Alexander Misurkin and Sergey Ryanzansky; and ESA astronaut Paolo Nespoli. http://www.nasa.gov/sites/default/files/thumbnails/image/37912591295_7c30a77efd_o.jpg

Frigid air blowing from Eastern Russia created dramatic cloud formations over the Sea of Okhotsk in late November, 2017. The Moderate Resolution Imaging Spectroradiometer (MODIS) aboard NASA’s Terra satellite acquired a true-color image of the stunning scene on November 25. http://www.nasa.gov/sites/default/files/thumbnails/image/image12022017_250m.jpg

NASA astronaut Randy Bresnik photographed Orbital ATK's Cygnus cargo spacecraft at sunrise, prior to its departure from the International Space Station at 8:11 a.m., Dec. 6, 2017. Expedition 53 Flight Engineers Mark Vande Hei and Joe Acaba of NASA gave the station's Canadarm2 robotic arm the command to release Cygnus. http://www.nasa.gov/sites/default/files/thumbnails/image/iss053e311637.jpg

During an engineering flight test of the Cloud-Aerosol Multi-Angle Lidar (CAMAL) instrument, a view from NASA Armstrong Flight Research Center’s ER-2 aircraft shows smoke plumes, from roughly 65,000 feet, produced by the Thomas Fire in Ventura County, California, around 1 p.m. PST on Dec. 5th, 2017. http://www.nasa.gov/sites/default/files/thumbnails/image/img_1907a.jpg

This false-color image is composed of 15 images taken through three color filters by NASA's Galileo spacecraft as it passed through the Earth-Moon system on Dec. 8, 1992. http://www.nasa.gov/sites/default/files/thumbnails/image/9460965180_e5246a9e56_o.jpg

The Aug. 21, 2017, total solar eclipse was rare in its long, uninterrupted path over land, which provided scientists with a rare chance to investigate the Sun and its influence on Earth in ways that aren’t usually possible. On Dec. 11, researchers discussed initial findings based on observations gathered during the eclipse. http://www.nasa.gov/sites/default/files/thumbnails/image/eclipse_full_res_0.png

Due to its unique evolutionary status, Cassiopeia A (Cas A) is one of the most intensely studied of these supernova remnants. http://www.nasa.gov/sites/default/files/thumbnails/image/casa_elements.jpg

This image from NASA's Mars Reconnaissance Orbiter (MRO) of northern Meridiani Planum shows faults that have disrupted layered deposits. http://www.nasa.gov/sites/default/files/thumbnails/image/pia22187.jpg

The Soyuz MS-05 spacecraft is seen as it lands with Expedition 53 Commander Randy Bresnik of NASA and Flight Engineers Paolo Nespoli of ESA (European Space Agency) and Sergey Ryazanskiy of the Russian space agency Roscosmos near the town of Zhezkazgan, Kazakhstan on Thursday, Dec. 14, 2017. http://www.nasa.gov/sites/default/files/thumbnails/image/39016438722_2a37bca029_o.jpg

The two-stage Falcon 9 launch vehicle lifts off from Space Launch Complex 40 at Cape Canaveral Air Force Station carrying the Dragon resupply spacecraft to the International Space Station. Dragon will bring supplies, equipment and new science experiments for technology research to the orbiting laboratory. http://www.nasa.gov/sites/default/files/thumbnails/image/38365591494_c3c003672f_o.jpg

This schlieren image shows an Air Force Test Pilot School T-38 in a transonic state, meaning the aircraft is transitioning from a subsonic speed to supersonic. http://www.nasa.gov/sites/default/files/thumbnails/image/f2p6n_hs_color_0.jpg

Acquired on November 29 by Operation IceBridge during a flight to Victoria Land, this image shows an iceberg floating in Antarctica's McMurdo Sound. http://www.nasa.gov/sites/default/files/thumbnails/image/mcmurdoiceberg_pho_2017333_lrg.jpg

Greetings from @Astro_Sabot, otherwise known as Mark Vande Hei, from aboard the International Space Station. http://www.nasa.gov/sites/default/files/thumbnails/image/2017-12-17_401f3777_little_rock_-_memphis_-_birmingham_-_jackson_-_florida_-_new_orleans.jpg

On Dec. 21, 1968, the Apollo 8 crew leaves the Kennedy Space Center's then-named Manned Spacecraft Operations Building during the mission's prelaunch countdown on the way to their history-making lunar orbiting flight. http://www.nasa.gov/sites/default/files/thumbnails/image/s68-55999.jpg

The Hubble Space Telescope captured what looks like a colorful holiday ornament in space. It's actually an image of NGC 6326, a planetary nebula with glowing wisps of outpouring gas. http://www.nasa.gov/sites/default/files/thumbnails/image/potw1010a_0.jpg

These images show a subtle feature on dwarf planet Ceres called Kwanzaa Tholus. http://www.nasa.gov/sites/default/files/thumbnails/image/tholus.jpg

An astronaut aboard the International Space Station took this photograph of the city lights of Naples and the Campania region of southern Italy. http://www.nasa.gov/sites/default/files/thumbnails/image/naples.jpg

In September 2017, a new iceberg calved from Pine Island Glacier—one of the main outlets where the West Antarctic Ice Sheet flows into the ocean. http://www.nasa.gov/sites/default/files/thumbnails/image/pineisland_oli_2017349_lrg.jpg