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NOVA
The 170-Year Search for a Planet Beyond Neptune
Planet Nine’s existence is not the first time astronomers have predicted a planet they couldn’t see. Clyde Tombaugh was looking for Planet X when he accidentally found Pluto. After Voyager 2 flew by Neptune in 1989, new calculations determined there was no Planet X. But three years ago, a disturbance was detected at the far reaches of the Solar System.
52:56
Do miniscule vibrating strands of energy hold the key to a unified theory of physics?
52:55
Combining the laws of the universe in one theory that explains it all is the Holy Grail
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53:40
Anorexia, bulimia, and other eating disorders are on the rise. What can be done?
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53:54
In Greenland, a deserted B-29 bomber awaits rescue for more than fifty years.