It goes like this:  Astronomers are able to measure how stars move.  The faster they move, the more massive they are.  Therefore, you can measure a Galaxy’s mass by how fast the stars move.  With this knowledge, a team from the University of California, Irvine, found the smallest galaxy ever found.

/READ MORE// Stellar Explosion

Segue 2, originally discovered in 2009, weighs a maximum of 150,000 times our sun making it the lightest ever known – our own Milky Way galaxy comes in at 10 million times more massive than our sun, and it is by no means a giant.

“Simulations predict that there should be tens of thousands of these things.”
– Evan Kirby, UCI Astronomer

Segue 2 is the first of what is expected to be many miniature galaxies orbiting the Milky Way.

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