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en.wikipedia.org/wiki/Black_hole

A black hole is a region of spacetime exhibiting such strong gravitational effects that ...... A much anticipated feature of a theory of quantum gravity is that it will not feature singularities or event horizons and thus black holes would not be real ...

www.pbs.org/wgbh/nova/next/physics/are-black-holes-real

Mar 10, 2016 ... Not so long ago, black holes were like unicorns: fantastical creatures that flourished on paper, not in life. Today, there is wide scientific ...

science.nasa.gov/astrophysics/focus-areas/black-holes

Don't let the name fool you: a black hole is anything but empty space. Rather, it is a great amount of matter packed into a very small area - think of a star ten ...

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.skyandtelescope.com/astronomy-resources/are-black-holes-real

Jul 22, 2014 ... Black holes seem to be the stuff of science fiction (and, in fact, have starred in many sci-fi books and movies), so it's not uncommon for people to ...

www.nasa.gov/audience/forstudents/5-8/features/nasa-knows/what-is-a-black-hole-58.html

Black holes may answer questions about the beginning and the future of the universe.

www.nationalgeographic.com/science/space/universe/black-holes

Learn more about these mighty voids from National Geographic.

news.nationalgeographic.com/2017/04/black-hole-event-horizon-telescope-pictures-genius-science

Apr 11, 2017 ... Using a massive telescope network, scientists have data in hand that could open new frontiers in our understanding of gravity.

hubblesite.org/reference_desk/faq/answer.php.id=64&cat=exotic

Astronomers have found convincing evidence for a supermassive black hole in the center of our own Milky Way galaxy, the galaxy NGC 4258, the giant elliptical  ...