Humans might not know of any intelligent beings beyond Earth, but if they exist, they might already know about us. New ...

A light-year is a unit of measurement used to describe the vast distances between objects in space. It represents the distance that light, traveling at a speed of approximately 300,000 kilometers per ...

A team led by the Italian National Institute for Astrophysics discovered the most distant known fossil galaxy — a relic of ...

The new galaxy, because of how far away it is, looks to observers exactly as it did when it was first created 3 billion years ...

For one, scientists observe a "cosmic fossil" called the cosmic microwave background (CMB). The first light that was free to ...

NASA astronomers have confirmed what may be the greatest discovery of the era. They found a significant reservoir of water that was hidden in the cosmos, and that surrounds a quasa ...

We live in a world defined by inches, feet and miles (or centimeters, meters and kilometers, if you prefer), and it’s not difficult for most of us to ...