Edwin Hubble’s photo; Martellus’ world map; Copernicus’ diagram of the solar system. Edwin Hubble’s photo that provided the first clue in calculating the size of the universe; the Apollo program’s ...

An accidental discovery might change how we think about one of the most mysterious structures in our solar system. The Oort Cloud, a large expanse of icy bodies revolving around the sun at a distance ...

The mysterious Oort cloud is the source of many of our solar system's comets, but astronomers still have no idea what it looks like. Now, new simulations may have given them a first glimpse. When you ...