Watch A Sidewalk Astronomer Online HD on HDtoday. John Dobson, an 89 year old with a white ponytail and knack for comedy, is the inventor of the Dobsonian telescope mount, which revolutionized astronomy by making large, inexpensive telescopes and deep space observing available to amateur astronomers around the world.
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What forms might life take in the Solar System and beyond? In the Academy's newest original planetarium show, see how a deeper understanding of Earth...
6.22017HD
CERN and the University of California-Santa Barbara are collaborating in the search for the elusive substance that physicists and astronomers believe...
02024HD
The Faraway Nearby follows the tragic life of pioneer physicist Joseph Weber, whose pursuit of gravitational waves takes him on a dizzying journey...
02001HD
214 million years ago a gigantic meteorite broke up and impacted Earth. 65 million years ago, the impact that killed the dinosaurs occurred where the...
8.71999HD
Chaco Canyon, located in northwest New Mexico, is perhaps the only site in the world constructed in an elaborate pattern that mirrors the yearly...
102007HD
Cave paintings and lunar calendars exist in the caves and remains of prehistoric hunters studied recently. What if Prehistoric Man were clever enough...
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A giant ball of gas and raw energy with a temperature of up to 15 million degrees, the sun is the origin of life on earth and influences an infinite...
72023HD
Explores the Pyramids of Giza as Egyptologists try to unravel the mysteries and decipher the clues behind these stone giants built over 4,500 years...
62006HD
Documentary about the Griffith Observatory, shown at their Leonard Nimoy Event Horizon Theater
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Partly adapted from cosmologist Stephen Hawking's popular book about his theories of the universe, this in-depth documentary also presents Hawking's...
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At the edge of our solar system supposedly lies an immense planet. Five to ten times the size of the Earth. Several international teams of scientists...
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Part of the Almost Famous series. Jocelyn Bell was a graduate student at Cambridge in 1967 when she pushed through the skepticism from her superiors...