Researchers say they've discovered the largest known object in the universe, a galactic superstructure called Quipu.

People talk about the universe starting with a Big Bang, but how could we possibly know anything about an event that happened billions of years ago – before our planet was even formed?

This era extends to ten trillion trillion trillion years after the big bang. Most of the mass that we can currently see in the universe will be contained in stars that have blown up and collapsed ...