For humans, the most important star in the universe is our Sun. The second-most important star is nestled inside the ...

Edwin Hubble's discovery of the expanding universe transformed cosmology, revealing countless galaxies and laying the ...

Hubble revealed a universe of galaxies that existed beyond ours — but he couldn't have done it without a little help.

One Vanderbilt University researcher thinks time travel might not just be for the movies. (Credit: Wikimedia Commons). Time ...