NASA's Perseverance rover is clogged up with pebbles

Two new studies using data from NASA’s retired Spitzer Space Telescope shed light on giant exoplanets and brown dwarfs, objects that aren’t quite stars but aren’t quite planets either.

News at a glance: Warmest oceans yet, a pig-to-human heart transplant, and the world’s largest breeding colony of fish

China's Shenzhou 13 astronauts manually fly cargo ship for emergency docking test