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en.wikipedia.org/wiki/Black_hole

A black hole is a region of spacetime exhibiting such strong gravitational effects that ...... merging black holes. On 14 September 2015 the LIGO gravitational wave observatory made the first-ever successful observation of gravitational waves.

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

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 ...

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 ...

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 ... 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 ...

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

Inside a black hole, nothing can hold together. At the "event horizon" then something traveling the speed of light can stay there, anything else falls in fur...

www.quora.com/What-are-black-holes-made-of-Is-it-matter-energy-or-something-else-entirely

Black-holes count as ordinary matter (made from 16 particles of standard model). As you know, ordinary matter and energy can be converted to each other (they.

medium.com/starts-with-a-bang/ask-ethan-56-are-black-holes-made-of-dark-matter-b2cc579a232c

Oct 3, 2014 ... There's five times as much dark matter as normal matter in the Universe. But how much of that matters for black holes? Believe it or not, the ...