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

When Apollo 10 launched on May 18, 1969, it was the fifth launch of the Saturn V. http://www.nasa.gov/sites/default/files/thumbnails/image/apollo10launch.jpg

NASA’s Green Propellant Infusion Mission, or GPIM, will prove a sustainable and efficient approach to spaceflight. http://www.nasa.gov/sites/default/files/thumbnails/image/19-03528_-_gpim_final_day1.jpg

A couple times a year, the International Space Station orbit happens to align over the day/night shadow line on Earth. http://www.nasa.gov/sites/default/files/thumbnails/image/403a0271.jpg

NASA is conducting field demonstrations of small drones navigating urban landscapes. http://www.nasa.gov/sites/default/files/thumbnails/image/new-era-of-flight-no-words_0.jpg

NASA and Northrop Grumman technicians in Promontory, Utah, have applied insulation to the final booster motor segment for the second flight of NASA’s deep space rocket, the Space Launch System, and NASA’s Orion spacecraft. http://www.nasa.gov/sites/default/files/thumbnails/image/booster_green_background.jpg