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en.wikipedia.org/wiki/Black_hole

A black hole is a region of spacetime exhibiting such strong gravitational effects that nothing—not even particles and electromagnetic radiation such as light—can escape from inside it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole. The boundary of the ...

www.spaceanswers.com/deep-space/what-is-a-black-hole-made-of

Sep 5, 2013 ... What do we know about these rather intense gravitational regions?

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

How Do Black Holes Form? Scientists think the smallest black holes formed when the universe began. Stellar black holes are made when the center of a very big star falls in upon itself, or collapses. When this happens, it causes a supernova. A supernova is an exploding star that blasts part of the star into space . Scientists ...

curious.astro.cornell.edu/about-us/86-the-universe/black-holes-and-quasars/general-questions/432-what-are-black-holes-made-of-intermediate

Jun 27, 2015 ... What is the type of matter that constitutes a black hole? Or is it matter at all? If the super dense material is continually being compressed where does it finally end? Surely there must be a limit or is it squeezed into energy? The matter that falls into a black hole is no different from the matter which makes up ...

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

Oct 19, 2017 ... Black holes are some of the strangest and most mysterious objects in the universe. Billions of them may exist in the Milky Way ... Shining light on binary black holes. In 2015, astronomers using the Laser Interferometer Gravitational- wave Observatory (LIGO) made the first detection of gravitational waves.

www.csmonitor.com/Science/2013/1113/What-are-black-holes-made-of-Scientists-closing-in-on-answer

Nov 13, 2013 ... Astronomers have found evidence of nickel and iron in the jets emitted by a black hole, suggesting that the baryonic matter that we're all familiar with plays a greater role in black holes than more exotic forms of matter.

www.quora.com/What-is-a-black-hole-made-of

All the stellar mass that fell in. And any net charge and angular momentum. So their properties are mass, charge, and angular momentum. What happens to the constituent particles is not known - torn apart into the fundamental constituent strings of string theory, perhaps?

hubblesite.org/reference_desk/faq/answer.php.id=56&cat=exotic

A common type of black hole is produced by certain dying stars. A star with a mass greater than about 20 times the mass of our Sun may produce a black hole at the end of its life. In the normal life of a star there is a constant tug of war between gravity pulling in and pressure pushing out. Nuclear reactions in the core of the ...

coolcosmos.ipac.caltech.edu/ask/230-How-are-black-holes-made-

Scientists think that black holes are created in places where matter gets extremely dense (where a huge amount of material is crammed into an extremely small space). This can happen in the centers of large galaxies or when a giant star collapses and shrinks during the final phases of its life. When matter gets so dense that ...