A Martian gravity map shows the Tharsis volcanoes and surrounding flexure. The white areas in the center are higher-gravity regions produced by the massive Tharsis volcanoes, and the surrounding blue areas are lower-gravity regions that may be cracks in the crust (lithosphere).
MIT/UMBC-CRESST/GSFC via NASA
This image from the Hubble Space Telescope shows the central region of the Tarantula Nebula in the Large Magellanic Cloud. The R136 star cluster — the blue stars in the lower right — contains massive stars, including nine newly-identified stars more than 100 times as massive as our sun.
NASA, ESA, P Crowther (University of Sheffield)
Tina Buechner da Costa (left) hopes to become Germany's female astronaut. Claudia Kessler (right), CEO of HE Space, is organizing a campaign to send the first German woman into space.
Soraya Sarhaddi Nelson/NPR
NASA has set a new launch opportunity, beginning May 5, 2018, for the InSight mission to Mars. This artist's concept depicts the InSight lander on Mars after the lander's robotic arm has deployed a seismometer and a heat probe directly onto the ground.
Expedition 43 NASA astronaut Scott Kelly (left) and his identical twin, Mark Kelly, pose for a photograph in 2015 at the Cosmonaut Hotel in Baikonur, Kazakhstan.
Bill Ingalls/NASA/Getty Images