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Planet Review

Planet Review. Watch the video clip. Write down at least 5 facts that you did not know. Write down one quiz question. (I will ask for these at a later date.) http ://richannel.org/the-solar-system. Answers to Questions on Planet Chart. Notes.

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Planet Review

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  1. Planet Review Watch the video clip. • Write down at least 5 facts that you did not know. • Write down one quiz question. (I will ask for these at a later date.) http://richannel.org/the-solar-system

  2. Answers to Questions on Planet Chart Notes • All of the heavy elements are born in a supernova.

  3. Answers to Questions on Planet Chart Notes 2. All of the planetesimals started spinning in the same direction when the nebula was a spinning disk. They continue to orbit around the sun in the same direction due to gravity and inertia.

  4. Answers to Questions on Planet Chart Notes 3. There is little/no gas on the inner planets due to: • Too close to the sun and the amount of heat causes the lighter elements to “burn off.” • The mass of the inner planets is much less than the outer planets and the gravitational force is too weak to hold on the lighter elements like Hydrogen and Helium.

  5. Vocabulary • Gravity – force of attraction between two objects • Inertia – the tendency of an object at rest to stay at rest or to keep moving in the same direction at the same speed, until acted upon by an outside force

  6. Retrograde Motion The retrograde motion of Mars in 2005.A composite image created by superimposing images taken on 35 different dates, each separated from the next by about a week.

  7. Vocabulary • Retrograde Motion- the apparent (not actual) backward motion of a planet • http://astro.unl.edu/classaction/animations/renaissance/retrograde.html

  8. Ancient reasons for studying the skies Remember Science is Tentative yet Reliable.

  9. History of Astronomy Notes Aristotle – 2000 years ago believed in a geocentricmodel

  10. History of Astronomy Notes Copernicus – 1500 AD believed in a heliocentricmodel

  11. Vocabulary • Geocentric model– Earth-centered solar system • Heliocentric model – Sun-centered solar system

  12. History of Astronomy Notes Galileo Galilei – 1600 AD • 1st scientist to use a telescope to view the stars • Saw 4 moons orbit Jupiter (confirmed Copernicus)

  13. History of Astronomy Notes Tycho Brahe – in late 1500’s he carefully observed and charted the positions of the planets for 20 years Kepler – in the early 1600’s he worked for Brahe and used his observations to develop his 3 laws of planetary motion

  14. History of Astronomy Notes Kepler’s 3 Laws of Planetary Motions http://youtu.be/XFqM0lreJYw http://www.teachersdomain.org/asset/npls12_vid_keplerorbits/

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