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How Did Earth and the Solar System Form? (12:05)

Key Ideas

As this video progresses, key ideas will be introduced to invoke discussion.

Key Ideas

Think about the following questions as you watch the video

  1. 01:34 In the last unit, you learned that about 98 percent of the Universe is hydrogen and helium, and that about 2 percent was everything else. What percentage of the Earth is made up of these other elements?
  2. 10:15 What is an exoplanet?
  3. 11:32 What makes planets more complex than stars?
  4. 02:30 How did all these elements get concentrated in planets like the Earth?
  5. 03:00 Can we predict the qualities of a molecule from the atoms that make it up?
  6. 03:47 Are the bonds between the atoms in molecules the same?
  7. 04:50 Are there molecules in space?
  8. 06:25 What is a protoplanetary disk?
  9. 07:43 Why are the planets closest to our Sun different from the planets further away?
  10. 08:36 What is accretion?
  11. 09:03 What’s the likely way the Moon was formed?