Black Holes

For thousands of years, Yemen has been one of the most important crossroads in the world. It was home to ancient kingdoms, the legendary land of Sheba, the port that gave mocha coffee its name, and a strategic gateway between the Red Sea and the Indian Ocean. Its mountains, tribe ...  Show more

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Dr Becky Smethurst is an astrophysicist, author, YouTuber and a Junior Research Fellow at the University of Oxford. Black holes are the weirdest, densest, most mysterious objects in the universe. However they're not black, and they're not holes. In fact pretty much everything you ...  Show more

In 1908, on a sunny, clear, quiet morning in Siberia, witnesses recall seeing a blinding light streak across the sky, and then… the earth shook, a forest was flattened, fish were thrown from streams, and roofs were blown off houses. The “Tunguska event,” as it came to be known ...

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Michio Kaku is the Professor of Theoretical Physics in the City College of New York, a futurist and an author. What happened before the big bang? Is there a white hole on the other end of a black hole? Can time go backwards? Are there other dimensions? Are there other parallel un ...  Show more