From tiny dust particles that slowly swirl together under the force of gravity, to distant stars that forge new elements, to the trillions of galaxies in our universe, we’ll explore the staggering ...

The Bullseye galaxy earned its nickname thanks to its wild number of rings. A smaller galaxy shot through its heart 50 ...

With this scale and other tools, Hubble had found and measured 23 other galaxies out to a distance of about 20 million light years. The second key was the work of Vesto Slipher, who had ...

Subsequent advances revealed first the size of the Solar System, then the distances ... scale for the Milky Way. Well before Hubble, some people had proposed there might be a universe beyond our ...