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There are 28 videos in this category and 47 videos in 6 subcategories.
Category Videos
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Not Right For WatchKnowLearn
Ages: 10 - 18
914 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.
May 26, 2011 at 11:33 PM
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Not Right For WatchKnowLearn
Ages: 10 - 18
850 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: unspecified
822 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.
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June 20, 2011 at 10:32 PM
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Not Right For WatchKnowLearn
Ages: 8 - 18
681 Views:
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These high-res time-lapse sequences captured by astronauts aboard the International Space Station give us a beautiful and clear view of some well-known coastlines and countries around the world. Get a good look at England, France, Italy, Egypt, Alger...ia, Tunisia, Greece, the island of Crete, Taiwan, South Korea, Japan, the United States, Mexico, Ecuador, Peru, Chile, Argentina, Cuba, and more. (03:47)
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December 21, 2011 at 05:21 PM
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Not Right For WatchKnowLearn
Ages: 10 - 18
516 Views:
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A shuttle mission to map planet earth might change our perspective of life itself. (47:07)
April 17, 2012 at 05:08 PM
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Not Right For WatchKnowLearn
Ages: 10 - 18
432 Views:
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Sal Khan discusses how the Earth is a the by-product of a local supernova. (10:08)
June 2, 2012 at 03:23 PM
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Not Right For WatchKnowLearn
Ages: 11 - 18
221 Views:
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From the ISS, We fly along over Earth's luminous nocturnal landscapes, with Dr. Justin Wilkinson as our guide. This intimate tour takes us over cities and coastlines in the Americas, the Middle East and Europe. (04:49)
October 2, 2012 at 07:45 PM
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Not Right For WatchKnowLearn
Ages: 8 - 18
131 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: 10 - 18
109 Views:
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Taking advantage of new satellite capabilities, scientists from NASA and NOAA released new imagery of Earth at night, providing a counterpart to the iconic "Blue Marble" image of the planet during the day. The imagery was generated by a sensor carrie...d aboard the NASA-NOAA Suomi National Polar-orbiting Partnership (NPP) satellite, known as the Visible Infrared Imaging Radiometer Suite, or VIIRS. It is sensitive enough to detect the nocturnal glow produced by the Earth's atmosphere. The day-night band from VIIRS is helping scientists monitor carbon emissions from natural gas and oil drilling operations, since it can detect flaring operations at night. The data has proven useful for monitoring wildfires, and has even provided a rare glimpse into upper atmospheric waves that can be generated from massive complexes of thunderstorms.
The sensor doesn't operate like a typical camera, which takes a picture in a single exposure. Rather, it produces an image by repeatedly scanning a scene and resolving it as millions of pixels. It then reviews the amount of light present in each pixel, amplifying very dark pixels and limiting the saturation of very bright pixels. (01:54)
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January 13, 2013 at 10:04 AM
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Not Right For WatchKnowLearn
Ages: 12 - 18
1292 Views:
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A year on earth is measured by one complete trip around the sun. This seems simple enough but there is a problem. The earth doesn't travel in a path around the sun that returns it to its starting point. So how do we know when the year starts or ends?... This video explains how it works, and why. (09:27)
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December 6, 2009 at 06:57 PM
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