... Since Saturn's axis is tilted as it orbits the Sun, Saturn has seasons, like those of planet Earth ... but Saturn's seasons last for over seven years. ... At first, the bright stars of the large asterism known as the (northern) Winter Hexagon might be hard to pick out in this gorgeous deep sky mosaic from December 2002. ... 1006 AD: Supernova in the Sky . ... A new star, likely the brightest supernova in recorded human history, appeared in planet Earth's sky in the year 1006 AD. ...