Orbit

interstellar visitor

In a first, scientists spotted an ‘interstellar visitor’ in our solar system

Science

The quarter-mile-wide hunk of space rock is affectionately being called “A/2017 U1.”

An artist’s rendering of icy objects in the Kuiper Belt.

What caused this space object’s weird orbit? ‘It was totally Planet Nine,’ one astronomer says.

Science
Samantha Cristoforetti of Italy shortly after landing near the town of Zhezkazgan, Kazakhstan.

She’s Italy’s rock star astronaut. And she has landed safely back home

Science
The World

Are we really alone in the universe?

Environment