The star patterns that form pretty pictures in the night sky are all temporary. Over time, their shapes will change, erasing the old pictures and creating new ones. It’s not something that’s visible in a human lifetime — or, with a few exceptions, in a hundred lifetimes. One of those exceptions is Arcturus, one of the brightest stars in the night sky. The yellow-orange star is in the east as the sky gets good and dark, well to the upper left of the Moon. Don’t confuse it with the brighter orange light that’s above the Moon — the planet Mars. One reason Arcturus shines so brightly is that it’s a close neighbor — just 37 light-years away. In fact, it’s about as close right now as it ever will be. Arcturus is racing across the sky at about 270,000 miles per hour relative to our own solar system — roughly the distance from Earth to the Moon. That’s faster than any of the other especially bright stars in the night sky. As a result of that motion, Arcturus will fade from view in a hurry — as
