The stars of the Big Dipper are between 58 and ... be sure to tell them that there’s a huge “ghostly circle” around the handle—the “Ursa Major Arc”—that could be the remains of ...

By tracing back Arcturus’ movements across the night sky, they proposed that the star would have matched up with Nabta Playa’s stone circle around 4800 B.C. “That makes it the oldest ...