Pic shows cluster of stars held together by gravity, Instagram users call it 'incredible'

NASA has shared an image of a globular cluster, a tightly bound group of stars held together by gravity, taken by Hubble Space Telescope. "Clusters like this one, located in...constellation Sagittarius, can contain millions of stars, many of them nearly as old as the universe," wrote NASA. While some Instagram users called the picture "incredible", another comment read, "I'm...taken aback."