This strange nebula, which sports a very long name, was discovered in 1977 and has changed dramatically over time.

The most recent measurement of a nearby galaxy cluster is deepening a disagreement about how fast the universe is expanding — ...

Today I want to talk about something beginning observers tend to overlook. It a process of the human eye called dark ...

The Swan Nebula (M17) glides through the early-morning sky near the border that Sagittarius shares with Scutum and Serpens ...

The space-based observatory, launched at the end of March, released its first set of images, in which a cloud of dust ...