Astronomers have spotted the faintest and lightest satellite galaxy ever found: a minuscule, tight-knit group of stars trailing the ... defies the conventional image of a distinctively shaped ...

This week’s image shows the globular cluster NGC 6717, located over 20,000 light-years away in the constellation of Sagittarius. A global cluster is a dense group of stars, often thousands or ...

"This newly revised NASA Hubble Space Telescope image of the Hickson Compact Group 31 (HCG 31) of galaxies highlights streams of star-formation as four dwarf galaxies interact," the agency wrote.