Hercules, a constellation of the Northern Hemisphere. It is best seen during the summer. It was represented by the ancient Greeks as the kneeling figure of the hero Hercules. Near the western edge is the globular star cluster Messier 13, comprising more than 50,000 stars about 30,000 light-years from the earth. Only a few stars of Hercules are brighter than fourth magnitude.
Until recently, most people assumed that if Mars had liquid water, it no longer did and hadn't for quite some time. But scientists have recently noticed some anomalies in photos of Mars that may suggest there is water. Could there be life, too?
It's tough to wrap your mind around a time when the Earth wasn't here. So how do Earth and the rest of the planets out there get their start in the universe?