The Indian Ocean "gravity hole" is a region where Earth's mass is reduced, leading to weak gravitational pull, ...

Sloan Digital Sky Survey The ultramassive black hole known as TON 618 sits amidst a distant quasar (circled) and is one of the largest yet ... them map the elusive ocean floor.

The biggest hole formed from a collapsed star in the Milky Way Galaxy resides 2,000 light years away from Earth in the Aquila constellation. Researchers spotted the black hole when they noted the ...