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There are 28 videos in this category and 36 videos in 4 subcategories.
Category Videos
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Not Right For WatchKnowLearn
Ages: 12 - 18
3724 Views:
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The Earth might seem solid beneath our feet but five billion years ago there was no sign of the planet we call home. Instead there was only a new star and a cloud of dust in our solar system. Over millions of years, a series of violent changes led to... the formation of our world and, eventually, the creation of life. (01:30:01)
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July 26, 2016 at 06:56 PM
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Not Right For WatchKnowLearn
Ages: 10 - 18
3507 Views:
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Home to millions of species, Earth is the only place in the universe where life is known to exist. Scientific evidence indicates that the planet formed 4.54 billion years ago, and life appeared on its surface within a billion years. (10:04)
June 6, 2011 at 11:03 PM
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Not Right For WatchKnowLearn
Ages: 10 - 18
3364 Views:
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A seven-minute tour of Earth's most impressive landscapes as captured by astronauts with their digital cameras. Dr. Justin Wilkinson from NASA's astronaut team describes the special places that spacemen focus on whenever they get a moment. (07:01)
May 26, 2011 at 11:33 PM
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Not Right For WatchKnowLearn
Ages: 10 - 18
3185 Views:
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Long before the 23 Degrees team shadows have been a significant indicator to the geometry of our planet's position around the sun and in this two-minute video students can learn how to determine the tilt of the Earth using their own height on the Sum...mer Solstice. (02:00)
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June 20, 2011 at 10:32 PM
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Not Right For WatchKnowLearn
Ages: 10 - 18
2690 Views:
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Sal Khan discusses how the Earth is a by-product of a local supernova. (10:08)
June 2, 2012 at 03:23 PM
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Not Right For WatchKnowLearn
Ages: 8 - 18
2213 Views:
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This entertaining video explains how we know the Earth is round. (02:42)
December 28, 2012 at 11:54 AM
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Not Right For WatchKnowLearn
Ages: 8 - 18
2177 Views:
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A fragile blue marble floating through space, Earth may seem small, but is unlike any planet ever discovered. (06:27)
June 8, 2011 at 11:17 PM
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Not Right For WatchKnowLearn
Ages: 9 - 18
1982 Views:
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Planet Earth is this solid thing you are standing on right now. In your everyday life you don't really waste a thought about how amazing this is. A giant, ancient, hot rock. How did it come into existence and how big is it really? You will be surpris...ed. The ground you are standing on is just a very, very small part of the big picture. (07:21)
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November 23, 2015 at 06:21 PM
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Not Right For WatchKnowLearn
Ages: 13 - 18
1474 Views:
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(CAUTION: The word 'hell' is used in the first 4 minutes.) The Earth might seem solid beneath our feet but five billion years ago there was no sign of the planet we call home. Instead there was only a new star and a cloud of dust in our solar system.... Over millions of years, a series of violent changes led to the formation of our world and, eventually, the creation of life. In this photo-realistic CGI epic, see how a boiling ball of rock transformed into the blue planet we know today. Explore every aspect of our world; learn how water first arrived on Earth, discover the vital role oxygen played as life forms began to evolve, and find out how land mammals evolved into dinosaurs and other giant beasts, before becoming extinct 65 million years ago. (01:30:00) Cutting-edge imagery also reveals how humans first began to walk on two feet and looks into the future to see what may be in store for our home over the next five billion years.
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December 27, 2016 at 10:44 AM
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Not Right For WatchKnowLearn
Ages: 12 - 18
622 Views:
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"How fast are you moving?" seems like an easy question, but it's actually quite complicated -- and perhaps best answered by another question: "Relative to what?" Even when you think you're standing still, the Earth is moving relative to the Sun, whic...h is moving relative to the Milky Way, which is...you get the idea. Tucker Hiatt unravels the concepts of absolute and relative speed. (06:09)
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June 14, 2017 at 07:09 PM
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