Mission engineers load the final cargo into the Cygnus resupply spacecraft onboard the Northrop Grumman Antares rocket, Tuesday, April 16, 2019. http://www.nasa.gov/sites/default/files/thumbnails/image/40659647513_000ebd78f2_k.jpg
A rainbow is seen at launch Pad-0A after the Northrop Grumman Antares rocket launched, Wednesday, April 17, 2019 at NASA's Wallops Flight Facility in Virginia. http://www.nasa.gov/sites/default/files/thumbnails/image/46908739984_40f0f88b9b_k_1.jpg
As the International Space Station orbited 265 miles above the southern Indian Ocean about halfway between Madagascar and Antarctica, the crew snapped this image of the Aurora Australis. http://www.nasa.gov/sites/default/files/thumbnails/image/iss059e021289.jpg
In celebration of the 29th anniversary of the launch of NASA's Hubble Space Telescope on April 24, 1990, astronomers captured an image of the tentacled Southern Crab Nebula. http://www.nasa.gov/sites/default/files/thumbnails/image/southcrab.jpg
Cerberus Fossae is a steep-sided set of troughs cutting volcanic plains to the east of Elysium Mons, Mars. This image was captured by the HiRISE camera on the Mars Reconnaissance Orbiter. http://www.nasa.gov/sites/default/files/thumbnails/image/pia23182.jpg
The International Space Station crew snapped this image of the Hudson Bay's frozen southern tip. http://www.nasa.gov/sites/default/files/thumbnails/image/iss059e028115.jpg
This sparkling burst of stars is Messier 75. It is a globular cluster: a spherical collection of stars bound together by gravity. Clusters like this orbit around galaxies and typically reside in their outer and less-crowded areas, gathering to form dense communities in the galactic suburbs. http://www.nasa.gov/sites/default/files/thumbnails/image/potw1916a.jpg
This final traverse map for NASA's Opportunity rover shows where the rover was located within Perseverance Valley on June 10, 2018, the last date it made contact with its engineering team. http://www.nasa.gov/sites/default/files/thumbnails/image/pia23178.jpg
NASA's InSight lander used the Instrument Deployment Camera (IDC) on the end of its robotic arm to image this sunset on Mars on April 25, 2019, the 145th Martian day, or sol, of the mission. This was taken around 6:30 p.m. Mars local time. http://www.nasa.gov/sites/default/files/thumbnails/image/pia23202_cc_0.jpg
In the late 1950's, NASA scientist Lewis Kaplan developed a groundbreaking way to calculate temperature in the atmosphere for weather forecasting. http://www.nasa.gov/sites/default/files/thumbnails/image/nimbus-iii_1.jpg
NGC 2903 is located about 30 million light-years away in the constellation of Leo (the Lion), and was studied as part of a Hubble survey of the central regions of roughly 145 nearby disk galaxies. http://www.nasa.gov/sites/default/files/thumbnails/image/potw1917a.jpg
SpaceX's Dragon lifted off on a Falcon 9 rocket from Space Launch Complex 40 at Cape Canaveral Air Force Station in Florida, Saturday, May 4. http://www.nasa.gov/sites/default/files/thumbnails/image/46856594435_206c773b5a_o.jpg
Today is National Teacher Day! NASA astronaut Ricky Arnold was a science teacher at John Hanson Middle School in Waldorf, Maryland. http://www.nasa.gov/sites/default/files/thumbnails/image/47715240192_79d04ce1d9_k.jpg
NASA's InSight Mars Lander used its Instrument Context Camera beneath the lander's deck to image these drifting clouds at sunset on the Red Planet. http://www.nasa.gov/sites/default/files/thumbnails/image/pia23180.jpg
Ellison Onizuka was the first Asian American to fly in space. http://www.nasa.gov/sites/default/files/thumbnails/image/s78-35395.jpg
Joe Acaba was selected as an astronaut in 2004 and has logged a total of 306 days in space on three flights. http://www.nasa.gov/sites/default/files/thumbnails/image/26788065189_b9244802f1_k.jpg
The waxing crescent moon is photographed just above Earth's limb. http://www.nasa.gov/sites/default/files/thumbnails/image/iss059e059210.jpg
On April 29 at NASA’s Kennedy Space Center in Florida, Orion’s service module moved to the lift station inside the assembly bay. http://www.nasa.gov/sites/default/files/thumbnails/image/p5020056.jpg
Jonny Kim was selected as a member of NASA's 2017 astronaut class, nicknamed
The irregular galaxy NGC 4485 shows all the signs of having been involved in a hit-and-run accident with a bypassing galaxy. Rather than destroying the galaxy, the chance encounter is spawning a new generation of stars, and presumably planets. http://www.nasa.gov/sites/default/files/thumbnails/image/stsci-h-p1930a-f-3213x2836.jpg