A team of astronomers have discovered helium escaping from a rocky planet, marking the first detection of an atmosphere on a rocky world.

The post First Atmosphere Detected on a Terrestrial World appeared first on Sky & Telescope.

We might be living through a comet shower created by a star that millions of years ago jostled the Oort Cloud surrounding the solar system.

The post Did a Passing Star Shower Us with Comets? appeared first on Sky & Telescope.