"In 1915, Einstein proposed a new theory of gravity. Soon, it was discovered that this theory of general relativity has special kinds of solutions that came to be known as black holes. They are distinguished by having singularities (places where gravity becomes so strong that our classical notion of space and time breaks down) as well as event horizons (regions from which even light cannot escape)." - Vishnu Jejjala (Wits). Read more
In this video, Professor Leonard Susskind explains what are black holes:
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What are Black Holes?
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