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The physics of the universe
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The Big Questions
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The incredible collaboration behind the International Space Station
Lesson duration 04:58
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RECOMMENDED LESSON
How small are we in the scale of the universe? - Alex Hofeldt
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?
What causes sunspots on the sun?
- aVolcanic eruptions on the sun
- bFluctuations in the sun’s magnetic activity
- cDebris passing in front of the sun
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- Complete any 30 lessons - you'll get a on each lesson you complete.
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