Trifid Nebula, Ground-Based View (1999)
“Located possibly as far away as 9,000 light-years from Earth in the constellation Sagittarius, the nebula is famous for its odd three-lobed appearance,” write DeVorkin and Smith. It is under threat from a nearby massive star (not seen in this photograph). “Eventually, the intense radiation from that star will destroy this stellar incubator,” they conclude. The area marked in green depicts the image shown next, taken by the Hubble in 1999.