NASA astronaut Mike Fincke works through a check list inside a mockup of Boeing’s CST-100 Starliner during a simulation at NASA’s Johnson Space Center on Aug. 21, 2019. via NASA https://ift.tt/2A3vb63

It’s Back to School Week and NASA has activities to keep students motivated. via NASA https://ift.tt/303wVqt

Scientists with NASA’s Mars 2020 mission and the European-Russian ExoMars mission traveled to the Australian Outback to hone their research techniques. via NASA https://ift.tt/34sZ79G

On Sept. 4, 2019, a loose chain of tropical cyclones lined up across the Western Hemisphere. via NASA https://ift.tt/32yqDAC

Located in the northern constellation of Ursa Major, which also includes the Big Dipper, nearby galaxy Messier 81 is easily visible through binoculars or a small telescope. via NASA https://ift.tt/2ZOK7iS

At the Gagarin Cosmonaut Training Center in Star City, Russia, Expedition 61 crewmember Jessica Meir of NASA climbs aboard a Soyuz trainer during final crew qualification exams on Aug. 30. via NASA https://ift.tt/2HFmqDy

NASA astronaut Christian Koch snapped this image of Hurricane Dorian as the International Space Station during a flyover on Monday, September 2, 2019. via NASA https://ift.tt/2Uq1OE8

NGC 5307, a planetary nebula that lies about 10,000 light-years from Earth, can be seen in the constellation Centaurus. via NASA https://ift.tt/2Llc1h6

Spitzer Space Telescope into orbit around the Sun on Aug. 25, 2003. Since then, the observatory has been lifting the veil on the wonders of the cosmos, from our own solar system to faraway galaxies, using infrared light. via NASA https://ift.tt/2NF8CMW

NASA cleared a milestone in preparation for Green Run testing of its Space Launch System (SLS) core stage with the lift and installation of the core stage pathfinder simulator onto the B-2 Test Stand. via NASA https://ift.tt/2ztaoZb