Today we're talking about our galactic neighborhood: The Milky Way. It's a disk galaxy, a collection of dust, gas, and hundreds of billions of stars, with the Sun located about halfway out from the center. [10:59]

Thanks to observations of galaxy redshifts, we can tell that the universe is EXPANDING! Knowing that the universe is expanding and how quickly its expanding also allows us to run the clock backwards 14 billion years to the way the...

Astronomers have captured an image of a jet of radiation leaving a black hole at the center of one galaxy to strike the edge of neighboring galaxy.

A video exploring what makes up the Milky Way galaxy. Understand how you can see part of the Milky Way by looking up into the night sky! [3:09]

Astronomers have been able to measure where the point of no return is at the edge of a black hole that is 50 million light-years away. Aired Oct. 5, 2012 [12:43 min]

Khan Academy shares cool pictures depicting the evolution of stars. [7:03]