How do we measure the motion of stars in our galaxy?
Watch the motion of two million stars as they drift over millions of years.
The Gaia mission has released initial data on more than a billion stars in our galaxy.
There’s a surprising lack of young stars in the center of our galaxy.
Only 1 in 5 Americans can see the Milky Way.
The center of our galaxy is less than 30,000 light years away, but it is notoriously difficult to observe.
Cold gas and dust emits faint light in the submillimeter range, so to study this material we need good radio telescopes.
There’s an interstellar cloud of gas heading for the Milky Way.
How do we determine the mass of our Milky Way galaxy? One way is to look at the trails of stars lost by globular clusters.