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The Inner Planets Notes

The Inner Planets Notes. How Many Planets?. How many planets are there in our Solar System? 9? 8? 13 Planets!!! 4 terrestrial planets 4 gas planets 5 dwarf planets. Planet Types. Terrestrial Planets “rocky planets” Mercury, Venus, Earth, Mars Orbit the Sun

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The Inner Planets Notes

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  1. The Inner Planets Notes

  2. How Many Planets? • How many planets are there in our Solar System? 9? 8? • 13 Planets!!! • 4 terrestrial planets • 4 gas planets • 5 dwarf planets

  3. Planet Types • Terrestrial Planets • “rocky planets” • Mercury, Venus, Earth, Mars • Orbit the Sun • Clear their own orbits of other objects • Dwarf Planets • Made of rock and ice • Ceres, Pluto, Haumea, Makemake, Eris • Orbit the Sun • Too small to fully clear orbits, often found in Asteroid Belt or Kuiper Belt

  4. Order of the Solar System • Sun • Inner Planets • Mercury • Venus • Earth • Mars • Asteroid Belt • Asteroids • Ceres • Outer Planets • Kuiper Belt • Oort Cloud

  5. 1st Rock - Mercury • Dead planet, shrinking • Extreme temperatures • Thin atmosphere • Fast orbit, slow rotation, year shorter than day! • No moons • Smallest planet

  6. 2nd Rock - Venus • Bright in night sky • Earth’s “evil twin”, same size, same materials • Thick, deadly atmosphere, massive lightning • Heavily volcanic • Hottest planet, runaway greenhouse effect • No moons

  7. 3rd Rock - Earth • One moon • Only planet with life • Ocean’s cover 75% of surface • Study of Earth: Geology (3rd & 4th Quarter)

  8. 4th Rock - Mars • The Red Planet • Half the size of Earth • Thin CO2 atmosphere • Used to have thicker atmosphere, liquid water on surface, maybe life • Most studied and visited planet • 2 moons, Phobos & Deimos

  9. 5th Rock - Ceres • Dwarf planet • Largest object in Asteroid Belt • 1st a planet, then asteroid, now dwarf

  10. Asteroid Belt • Asteroid Belt between Mars & Jupiter • Asteroids: small, rocky objects, most under 1 km in diameter • Over 100,000 asteroids in the belt • “leftover” pieces from solar system creation • Some have large elliptical orbits that bring them closer to the Sun than the Earth, and could smash into Earth!!!

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