Surveying The Solar System Poking Around the Neighbourhood.
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Transcript of Surveying The Solar System Poking Around the Neighbourhood.
What’s Out There?
• What are the celestial bodies?
• How far away are they?
• What does the earth have in common with them?
• How is the Earth different?
We’ve gotten a few answers…
• Hubble
• Space Probes– Venera– Solar Observer– Pioneer– Viking– Voyager– Pathfinder (Mars)– Apollo (manned)
The Sun
• 1.4 Million km in diameter– 1,400,00 km – 1.4 x 106 km
• Composed mostly of hydrogen• Surface constantly churns and writhes• Some areas are cooler - appear darker
– Known as sun spots
• Violent outbursts called solar flares erupt regularly
• Flares make solar wind
Sun Statistics• Mass (kg) 1.989e+30• Mass (Earth = 1) 332,830• Equatorial radius (km) 695,000 km• Equatorial radius (Earth = 1) 108.97• Mean density (gm/cm^3) 1.410• Rotational period (days) 25-36*• Escape velocity (km/sec) 618.02• Mean surface temperature 6,000°C• Corona Temperature 1,000,000 °C• Internal Temp 15 000
000 °C• Age (billion years) 4.5
Principal chemistry
•Hydrogen 92.1%•Helium 7.8%•Oxygen 0.061%•Carbon 0.030%•Nitrogen 0.0084%•NeonIron 0.0076%•Silicon 0.0037%•Magnesium 0.0031%•Sulfur 0.0024%•All others 0.0015%
The Planets
• There are 9 planets in our solar system• All are quite different from each other• Inner 4 are rocky (M, V, E, M)• Outer 4 are gas giants (J, S, U, N)• Last on - Pluto - just plain weird (P)
• My Vaccuum Exploded Mom it Just
Sucks Up Nothing - Poop!