Sometimes big things come in small packages, or so the saying goes. Such is the case with Segue 2, the name of a tiny galaxy near our own that is being called the "most lightweight" ever discovered.

Observations of the ultra-faint galaxy Segue 2, using the W. M. Keck Observatory, determined its mass to be significantly lower than previously estimated, at approximately 1000 stars. Segue 2's low ...

Our Milky Way galaxy is on the heavy side. We have hundreds of billions of stars, and an even more massive amount of dark matter. Now astronomers have found the ying to the Milky Way’s yang. With just ...