1
By TED-Ed
Published in 2014
In a fun, excited talk, teenager Henry Lin looks at something unexpected in the sky: galaxy clusters. By studying the properties of the unverse's largest pieces, says the Intel Science Fair Winner, we can learn quite a lot about our own world ad galaxy.
Grade Level   6 7 8 9 10 11 12
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2
By TED-Ed
Published in 2013
Why do we see those stunning lights in the northern- and southernmost portions of the night sky? The Aurora Borealis and Aurora Australis occur when high-energy particles are flung from the Sun's corona toward the Earth and mingle with the neutral atoms in our atmosphere -- ultimately emitting...
Grade Level   3 4 5 6 7 8 9 10 11 12
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3
By TED-Ed
Published in 2013
How can the shadow of the tiny moon eclipse the sight of the gargantuan sun? By sheer coincedence, the dsc of the sun in 400x larger than the disc of the moon, but it's 390x farther from Earth -- which means that when they align just right, the moon blocks all but the sun's glowing corona. Andy...
Grade Level   K 1 2 3 4 5 6 7 8 9 10 11 12
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4
By TED-Ed
Published in 2013
What's six miles wide and can end civilization in an instant? An asteroid -- and there are lots of them out there. With humor and great visuals, Phil Plait enthralls the TEDxBoulder audience with all the ways asteroids can kill, and what we must do to avoid them.
Grade Level   6 7 8 9 10 11 12
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5
By TED-Ed
Published in 2017
In 1995, scientists pointed the Hubble Telescope at an area of the sky near the Big Dipper. The location was apparently empty, and the whole endeavor was risky -- what, if anything, was going to show up? But what came back was nothing short of spectacular: an image of over 1,500 galaxies glimmering...
Grade Level   K 1 2 3 4 5 6 7 8 9 10 11 12
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