Abell 2255 is a cluster containing between 300 and 500 constituent galaxies, many of which are merging. It's located around ...

Ask someone where outer space is, and they’ll probably point at the sky. It’s up, right? Simple. Except, no one really knows where “air space” ends and “outer space” begins.

The expanse of space and the oceanic abyss hold a fascination for humanity; extreme environments where our bodies and ...