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en.wikipedia.org/wiki/Black_hole

A black hole is a region of spacetime exhibiting such strong gravitational effects that ..... On the other hand, indestructible observers falling into a black hole do not notice any of these effects as they cross the event horizon. According to their own  ...

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

Black holes can come in a range of sizes, but there are three main types of black holes. ... If Black Holes Are "Black," How Do Scientists Know They Are There?

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

However, recent evidence from Chandra, XMM-Newton and Hubble strengthens the case that mid-size black holes do exist. One possible mechanism for the ...

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 ... Next question: Do all stars become black holes?

www.ask.com/youtube?q=Where+Do+Black+Holes+Come+From%3F&v=8grTbzAo0PA
Nov 20, 2012 ... Black holes are created when a large star collapses under the force of gravity having run out of ... i have a question.. how do we know this.

www.physicsoftheuniverse.com/topics_blackholes_blackholes.html

Having said that, black holes can grow to great size over time as they assimilate more and more matter and even other black holes, and some do become ...

minerva.union.edu/vianil/web_stuff2/How_are_Black_Holes_Formed.htm

Small Stars Do Not Create Black Holes: When Smaller Stars "Die" They Become ... Black Holes come into existence when the atomic and nuclear forces within a ...

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

Apr 9, 2015 ... Black holes are some of the strangest and most mysterious objects in the universe. ... out like spaghetti, though your death would come before you reached singularity. ... Black Hole Quiz: How Well Do You Know Nature's Weir.

www.universetoday.com/33454/how-do-black-holes-form

Sep 27, 2013 ... Black holes are the most exotic and awe inspiring objects in the Universe. Take the mass of an entire star. Compress it down into an object so ...