Add Yahoo as a preferred source to see more of our stories on Google. This illustration shows a possible view from Earth of the early stages of a predicted merger billions of years from now between ...

For more than a decade, the collision between the Milky Way and Andromeda galaxies has been treated as a settled fact of cosmic destiny. A peer-reviewed study published in Nature Astronomy now ...

Imagine you somehow wake up after 4.5 billion years. When your alarm goes off at 5 am, you step outside because you have made a promise to yourself to get some fresh air first thing in the morning.