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Luna, The Moon

Luna, The Moon. Ch 21.4. The Moon. Except for the Sun, the Moon affects us more than any other celestial body…tides & eclipses. A few facts:. Diameter: 3476 km Density: 3340 kg/m 3 Sidereal month: 27.32 days (one orbit about the Earth)

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Luna, The Moon

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  1. Luna,The Moon Ch 21.4

  2. The Moon • Except for the Sun, the Moon affects us more than any other celestial body…tides & eclipses.

  3. A few facts: • Diameter: 3476 km • Density: 3340 kg/m3 • Sidereal month: 27.32 days (one orbit about the Earth) • Rotates on its axis at the same rate as it orbits the Earth. • Avg Distance from Earth: 384,400 km (measured by lasers to reflectors on Moon)

  4. Phases of the Moon • http://www.enchantedlearning.com/subjects/astronomy/ • http://www.classzone.com/books/earth_science/terc/content/visualizations/es2503/es2503page01.cfm • Complete the phases of the moon diagram

  5. Answers

  6. Lunar Eclipses • Penumbra = shadow within which sunlight is partially blocked • Umbra = shadow within which sunlight is completely blocked (Total eclipses) • http://www.classzone.com/books/earth_science/terc/content/visualizations/es2504/es2504page01.cfm

  7. Lunar Eclipses http://www.enchantedlearning.com/subjects/astronomy/moon/Lunareclipse.shtml http://www.mreclipse.com/Special/LEprimer.htm l Write a description of a lunar eclipse and label the diagram.

  8. Lunar Eclipse

  9. Lunar Eclipse Answers

  10. Solar Eclipses • Umbral shadow of the moon is only about 150 km wide where it reaches the earth • http://www.classzone.com/books/earth_science/terc/content/visualizations/es2505/es2505page01.cfm

  11. Solar Eclipse http://www.enchantedlearning.com/subjects/astronomy/sun/solareclipses.shtml http://www.mreclipse.com/Special/SEprimer.html Write a description of a solar eclipse and label the diagram.

  12. Solar Eclipse Answers

  13. Lunar Surface • Highlands = light colored rock • Maria = dark areas, smooth, dark solid lava flows flooded the basins • Rilles = deep channels perhaps caused by volcanic activity • Craters = depressions from meteoroid impacts • Rays = displaced material

  14. Interior • Seismologists look at seismographs and see weak quakes • 4 seismometers were placed during Apollo landings • Crust is thin on the side towards Earth • Crust is thick on back side • Perhaps has a small, partially molten metallic core • Little of no volcanic activity has taken place in 3 billion years

  15. Chemical composition • Similar to the silicate rocks of the Earth’s crust • Water is nearly absent

  16. Atmosphere • The moon has a minimal atmosphere since gases escape almost immediately.

  17. Other moons • Mars • Asteroids caught by Mar’s gravity • Jupiter • Io = volcanically active • Saturn • Frozen water with rocky material • Uranus • Ice, rock & heavily cratered • Neptune • Triton revolves in retrograde orbit & geologically active • Pluto • Charon

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