A Mars image shows a strange square formation. Some think it's artificial, but experts suggest natural causes.

Have you noticed that when you watch someone move—like watching people dance, or watching your favorite sport—that you almost have to stop yourself from mimicking the movement? That’s because people ...

The Event Horizon Telescope captured the first image of the Milky Way galaxy's supermassive black hole Sagittarius A* — our galaxy's "black hole heart." Credit: ESO ...