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Solar system

Solar system

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Solar System Solar System Presentation Transcript

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  • Earth
  • Atmosphere … Gives us the air we breathe
  • Protects us from meteorites and harmful cosmic radiation
  • Blanket covering the Earth from heat at day and cold at night
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  • Bye-bye, Earth!
  • Hi Mercury!
  • Mariner 10: images of Mercury
  • 4.6 billion years ago: Heavy Bombardment
  • Barringer crater, Arizona 49,000 yr old Iron meteorite of size 50 m, mass 300,000 ton Impact velocity 11 km/sec Our Earth is a target, too!
  • 150 known impact sites on Earth Diameters from 50-70 m to 200 km
  • 65 million years ago a huge meteorite of 10 km size hit the Earth
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    • World-wide fires
    • 1-km-hign tsunamis
    • Acid rains and atmospheric pollution
    • Darkness and severe winter for many decades
    ¾ of all living species have been killed
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  • Our Moon could have been formed in a giant collision 4.5 billion years ago
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  • The Peekskill meteorite October 9, 1992 12 kg stony meteorite hit the Earth
  • Venus the Beautiful
  • Venus - the brightest "star" The goddess of beauty
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  • Venus and Earth - sister planets?
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  • Flight over Venus
  • Fig. 17-3a, p.349 Greenhouse for trapping heat Runaway greenhouse effect
  • Atmosphere lets the visible sunlight in, but traps infrared radiation and prevents rapid cooling of the surface at nights
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  • "It will be possible to see cities on Mars, to detect navies in [its] harbors, and the smoke of great manufacturing cities and towns... Is Mars inhabited? There can be little doubt of it ... conditions are all favorable for life, and life, too, of a high order. Is it possible to know this of a certainty? Certainly." Samuel Leland 1895 Seasons on Mars? Channels for irrigation ???
  • Sorry, no channels – just dry canyons, lava flows and dusty deserts …
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  • Dry riverbeds, traces of flooding
  • No water, just dry desert …
  • Salty rocks on Mars: former sea bottom
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  • Journey to outer planets 8 billion miles through space!
  • Giant planets
  • Jupiter – the biggest planet
  • The Red Spot
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  • Io Europa Ganymede Callisto Total 61 moons discovered so far Most are captured small asteroids Galilean moons:
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  • Europa – a giant skating rink
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  • Io – giant volcanoes
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  • Saturn – second largest planet So fluffy – it could float in water
  • Enormous winds: 1800 km/hr !! The Great White Spot: huge storm
  • Thickness: less than 1 km Extend from 74,000 to 137,000 km Discovered by Huygens in 1659 Saturn rings
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  • Flying through the rings
  • Titan, the mysterious moon of Saturn
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  • Uranus
  • What happened to Miranda?
  • Neptune
  • Triton
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  • Pluto and Charon
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  • The Kuiper Belt – home for short-period comets?? Starting in 1992, astronomers have become aware of a vast population of small bodies orbiting the sun beyond Neptune. There are at least 70,000 "trans-Neptunians" with diameters larger than 100 km in the radial zone extending outwards from the orbit of Neptune (at 30 AU) to 50 AU.
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