Today is National Teacher Day! NASA astronaut Ricky Arnold was a science teacher at John Hanson Middle School in Waldorf, Maryland. via NASA https://go.nasa.gov/2Jk0109

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. via NASA https://go.nasa.gov/2V6UPic

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. via NASA https://go.nasa.gov/2DJrswQ

In the late 1950’s, NASA scientist Lewis Kaplan developed a groundbreaking way to calculate temperature in the atmosphere for weather forecasting. via NASA https://go.nasa.gov/2DLB9uq

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. via NASA https://go.nasa.gov/2GVyuQV

The Orbiting Carbon Observatory 3, or OCO-3, sits on the large vibration table (known as the “shaker”) in the Environmental Test Lab at the Jet Propulsion Laboratory. via NASA https://go.nasa.gov/2GTftOU

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. via NASA https://go.nasa.gov/2DCtIpi

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. via NASA https://go.nasa.gov/2L68mag

The International Space Station crew snapped this image of the Hudson Bay’s frozen southern tip. via NASA https://go.nasa.gov/2UI1WNP

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. via NASA https://go.nasa.gov/2VjCxP9