This Hubble Space Telescope mosaic is of a portion of the immense Coma cluster of over 1,000 galaxies, located 300 million light-years from Earth. via NASA https://ift.tt/2FPwtHp

In Mars’ Wirtz Crater, these dunes are likely active. via NASA https://ift.tt/2TXbOED

NASA Deputy Associate Administrator Melanie Saunders and astronaut Mike Massimino ring the closing bell of Nasdaq after the NASA’s InSight lander successfully touched down on the surface of Mars. via NASA https://ift.tt/2DYpVEF

NASA social media participant Bryan Branly takes a photograph of the Mars Cube One (MarCO) model before the Mars InSight pre-landing briefing. via NASA https://ift.tt/2ByIayc

A new study using observations by NASA’s Spitzer Space Telescope reports for the first time that silica — one of the most common minerals found on Earth — is formed when massive stars explode. via NASA https://ift.tt/2PKyb1g

On Nov. 20, 1998, the Zarya Functional Cargo Block launched from the Baikonur Cosmodrome to serve as a temporary control module for the nascent International Space Station. This October 2018 photo shows the station today, fully complete. via NASA https://ift.tt/2FwYCmt

“Captured Cygnus today with @Astro_Alex…Proud to have The SS John Young on-board!” said astronaut Serena Auñón-Chancellor today, as the International Space Station crew brought aboard the latest Northrop Grumman Cygnus cargo craft, loaded with almost three tons of food, fuel and supplies. via NASA https://ift.tt/2PDOBsd

International Space Station crew brought aboard the latest Russian Progress cargo craft. via NASA https://ift.tt/2Q9GMdw

​The Northrop Grumman Antares rocket, with Cygnus resupply spacecraft onboard, is seen above the Thomas Jefferson Memorial in Washington, DC, on Nov. 17, 2018. via NASA https://ift.tt/2FmZA4G

In the wake of a fire, a burn scar appears which takes a long time to heal. This scar is from the Woolsey fire which has taken its toll around Thousand Oaks, California. via NASA https://ift.tt/2DpIHnn