We measure the extremely long distances between things in space by light years. A light year is the distance that light travels in one Earth year. Light travels at about 300,000 kilometres per second.

Researchers analyze fossilized sounds of the Big Bang in space, and the distortions present in it indicate that the Milky Way ...

Imagine waking up one morning to the news: a black hole is drifting close to our solar system. It sounds like the plot of a .