The alien known as Harry Vanderspeigle first arrived in Earth’s atmosphere with a simple mission. He was supposed to deliver a machine designed to destroy humanity (but not the planet or any other ...

If aliens wanted to study Earth’s atmosphere, they’d have to wait for a lunar eclipse. This happens when the Earth moves between the Sun and the Moon perfectly enough to cast a shadow on the Moon.

K2-18 b is one strange place. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Breaking space news, the latest updates on rocket launches, ...