Apollo 11 backup crew members Fred Haise (left) and Jim Lovell prepare to enter the Lunar Module for an altitude test. http://www.nasa.gov/sites/default/files/thumbnails/image/apollo_11_bu_crew_lovell_haise_lm_alt_test_mar_20_1969_ap11-69-h-548hr.jpg

The waxing gibbous moon is pictured above Earth's limb as the International Space Station was orbiting 266 miles above the South Atlantic Ocean. http://www.nasa.gov/sites/default/files/thumbnails/image/stationmoon.jpg

Margaret W. ‘Hap’ Brennecke was the first female welding engineer to work in the Materials and Processes Laboratory at NASA’s Marshall Space Flight Center. http://www.nasa.gov/sites/default/files/thumbnails/image/hap_brennecke_1.jpg

This fuzzy orb of light is a giant elliptical galaxy filled with an incredible 200 billion stars. http://www.nasa.gov/sites/default/files/thumbnails/image/potw1911a.jpg

NASA astronaut Nick Hague completed the first spacewalk of his career on Friday, March 22, 2019. He and fellow astronaut Anne McClain worked on a set of battery upgrades for six hours and 39 minutes, on the International Space Station’s starboard truss. http://www.nasa.gov/sites/default/files/thumbnails/image/nick.jpg

A static hot-fire test of the Orion spacecraft's Launch Abort System Attitude Control Motor to help qualify the motor for human spaceflight, to help ensure Orion is ready from liftoff to splashdown for missions to the Moon. http://www.nasa.gov/sites/default/files/thumbnails/image/ngacm1_1.jpg

When Joan Stupik was a child, her parents bought her a mini-planetarium that she could use to project the stars on her bedroom ceiling. http://www.nasa.gov/sites/default/files/thumbnails/image/joan_stupik.jpeg

A small asteroid was caught in the process of spinning so fast it’s throwing off material, according to new data from NASA’s Hubble Space Telescope and other observatories. http://www.nasa.gov/sites/default/files/thumbnails/image/stsci-h-p1922a-m-2000x1164.png

This star-studded image shows us a portion of Messier 11, an open star cluster in the southern constellation of Scutum (the Shield). Messier 11 is also known as the Wild Duck Cluster, as its brightest stars form a “V” shape that somewhat resembles a flock of ducks in flight. http://www.nasa.gov/sites/default/files/thumbnails/image/potw1912a.jpg

Astronaut Nick Hague performs a spacewalk on March 29, 2019. http://www.nasa.gov/sites/default/files/thumbnails/image/iss059e005744.jpg

In Alaska, 5 percent of the land is covered by glaciers that are losing a lot of ice and contributing to sea level rise. http://www.nasa.gov/sites/default/files/thumbnails/image/46713638424_0f32acec3f_k.jpg

An astronaut aboard the International Space Station snapped this image as the station flew 265 miles above this cloudy formation in the south Indian Ocean. http://www.nasa.gov/sites/default/files/thumbnails/image/iss059e006522.jpg

In December 2018, an astronaut on the International Space Station took this highly oblique photograph of snow on the eastern Tien Shan and Taklimakan Desert in Central Asia. http://www.nasa.gov/sites/default/files/thumbnails/image/iss057e111453_lrg.jpg

As Glenn Graham, director of Armstrong Flight Research Center's Office of Safety and Mission Assurance flew his T-34 aircraft over California's Antelope Valley, he beheld a once in a lifetime event--a superbloom. http://www.nasa.gov/sites/default/files/thumbnails/image/poppies.jpeg

Astronauts Jim Buchli and Janet Kavandi are inducted into the U.S. Astronaut Hall of Fame Class of 2019 during a ceremony on April 6, 2019. http://www.nasa.gov/sites/default/files/thumbnails/image/33674540488_347f845a9d_k.jpg

David Saint-Jacques of the Canadian Space Agency completed the first spacewalk if his career on Monday, April 8, 2019. http://www.nasa.gov/sites/default/files/thumbnails/image/saintjacques.jpg

NASA successfully launched the Auroral Zone Upwelling Rocket Experiment or AZURE mission on April 5, 2019, from the Andøya Space Center in Norway. http://www.nasa.gov/sites/default/files/thumbnails/image/aurora_prior_to_launch.jpg

Space Launch System Ascent Testing Advances Understanding of Cargo Configuration http://www.nasa.gov/sites/default/files/thumbnails/image/lrc-2019_h1_p_sls-022204_copy.jpg

America’s powerful new deep space rocket, NASA’s Space Launch System, will face harsh conditions and extreme temperatures in flight when launching NASA’s Orion spacecraft and potential cargo to lunar orbit, and for that, it’ll need strong protection. http://www.nasa.gov/sites/default/files/thumbnails/image/mcf18-0026_1057_lt_to_rt_tangie_gould_courtney_moore.jpg

A Northrop Grumman Antares rocket carrying a Cygnus resupply spacecraft is seen during sunrise on Pad-0A, Tuesday, April 16, 2019, at NASA's Wallops Flight Facility in Virginia. http://www.nasa.gov/sites/default/files/thumbnails/image/33744244598_a8266fedaf_o.jpg