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black hole
NOUN
1.
Astronomy. a theoretical massive object, formed at the beginning of the universe or by the gravitational collapse of a star exploding as a supernova, whose gravitational field is so intense that no electromagnetic radiation can escape.
Source: Dictionary.com
black hole | Define black hole at Dictionary.com
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en.wikipedia.org/wiki/Black_hole

A black hole is a region of spacetime exhibiting such strong gravitational effects that ...... does not appear to carry any additional information about the matter that formed the black hole, meaning that this information appears to be gone forever.

www.nasa.gov/audience/forstudents/k-4/stories/nasa-knows/what-is-a-black-hole-k4.html

A black hole is a place in space where gravity pulls so much that even light cannot get out.

www.dictionary.com/browse/black-hole

Black hole definition, Astronomy. a theoretical massive object, formed at the beginning of the universe or by the gravitational collapse of a star exploding as a  ...

www.space.com/15421-black-holes-facts-formation-discovery-sdcmp.html

Apr 9, 2015 ... Black holes are some of the strangest and most fascinating objects found in outer space. They are objects of extreme density, with such strong ...

www.merriam-webster.com/dictionary/black%20hole

Define black hole: an invisible area in outer space with gravity so strong that light cannot get out of it — black hole in a sentence.

www.urbandictionary.com/define.php?term=black%20hole

Top definition. black holeunknown. An area of space-time with a quantum singularity at its center. The singularity has a theoretically infinite mass, making it  ...

www.webopedia.com/TERM/B/black_hole.html

Packets that are forwarded to that router simply get dropped and never arrive at their destination. Black holes are unable to generate destination unreachable ...

whatis.techtarget.com/definition/black-hole

2) In physics and astronomy, a black hole is a region in time and space within which gravity is so strong that nothing can escape, not even electromagnetic ...

www.theguardian.com/science/across-the-universe/2016/feb/01/what-is-a-black-hole-stephen-hawking-reith-lectures

Feb 1, 2016 ... Stephen Hawking has chosen black holes as the subject of his BBC Reith Lectures. Here's why these mysterious objects remain at the forefront ...