The first planet detected in a Sun-like star, in 1995, was 51 Pegasi b, located 50 light-years from Earth. It is a gas giant with half the mass of Jupiter in an extremely close orbit to its star ...

Across the sky, more than 100 stellar-mass black holes are hidden within a large cluster of stars. The star cluster is named Palomar 5, and it stretches out over 30,000 light-years. It is located ...