The brightest planets in the night sky are aligning for a must-see show. The moon, Venus, and Jupiter shortly after sunset both Feb. 25 and 26, coming together in a tight triangle. With any luck, you might also spot tiny Mercury down near the horizon just as the sun goes down. Start looking tonight!
This artist’s impression shows a binary system containing a stellar-mass black hole called IGR J17091-3624, or IGR J17091 for short. The strong gravity of the black hole, on the left, is pulling gas away from a companion star on the right. This gas forms a disk of hot gas around the black hole, and the wind is driven off this disk.