Everyone knows about the Solar System, and the planets that make it ... and then afterwards, it was slowing down in its movement across the sky.” One mathematician who theorised this was Mary ...

Our solar system passed through a vast wave of gas and ... gas and dust in the Milky Way that undulate up and down over millions of years. One of the closest and best-studied of these is the ...

The Oort Cloud is the name given to a theorized group of potentially trillions of icy objects on the edge of our solar system. But while it has been accepted as a theory for over 70 years ...