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There are 26 videos in this category and 42 videos in 4 subcategories.
Category Videos
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Not Right For WatchKnowLearn
Ages: 10 - 18
1784 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
1652 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
1486 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
1009 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: 8 - 18
692 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: 11 - 18
680 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: 10 - 18
629 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: 13 - 18
512 Views:
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Concepts: Polestars and how they are viewed in the sky, Precession, why it happens | How will Polestars change
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Part of a Blended Classroom taught at Millard West High School.
Produced for Millard Public Schools by Justin Higgins. ...(06:33)
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November 21, 2013 at 01:40 PM
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Not Right For WatchKnowLearn
Ages: 8 - 18
490 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
312 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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