There are perhaps as many Trojan asteroids orbiting 60 degrees ahead of and behind Jupiter as in the asteroid belt between Jupiter and Mars. Now NASA has given a go-ahead for the 1st mission to Jupiter’s Trojans.
A planetary nebula isn’t related to planets. It’s an old star, sloughing off its outer layers. Now astronomers have spied 2 ultra-close stars at a planetary nebula’s heart. The pair orbits in only 3 hours!