SPONGE n n What objects make up our solar system ?
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SPONGE
What objects make up our solar system ?
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Solar SystemSolar System
Solar System – composed of the Sun (a star) and the planets and other bodies that travel around the Sun.
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PercentagesPercentages
Sun: 99.85% Planets: 0.135% Comets: 0.01% ? Moons: 0.00005% Minor Planets: 0.0000002% Meteoroids: 0.0000001% Interplanetary Medium: 0.0000001%
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Solar System StructureSolar System Structure
The planets revolve around the Sun in orbits that lie close to a common plane. (Mercury 7o ; Pluto 17.2o)
All planets orbit the sun in a counter-clockwise fashion as seen from above the north pole of the sun. Orbits are contained within a very narrow disk or plane.
Most orbits are elliptical with the exception of Mercury and Pluto.
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Small Rocky WorldsSmall Rocky Worlds Terrestrial Planets – the small, dense,
rocky planets of the inner solar system. Mercury Venus Earth Mars
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Terrestrial PlanetsTerrestrial Planets
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Big Gaseous WorldsBig Gaseous Worlds
Gas Giants – the large, gaseous planets of the outer solar system.
Jupiter Saturn Uranus Neptune
– All gas giants have rings!
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Gas GiantsGas Giants
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PlutoPluto Pluto – doesn’t fit either category. Pluto is
a small icy world clearly different from either the Terrestrial and Gas Giant worlds.
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Acronym for Order of Acronym for Order of PlanetsPlanets
MM VV EE MM JJ SS UU NN
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Age of the Solar System
Oldest Rocks dated on Earth ~ 3.9 billion years, however the Earth’s own volcanism and plate-tectonics erase most of the evidence!!
Lunar Rocks are dated to 4.48 billion years. Meteorites ~ 4.6 billion years Sun estimate based on all the circumstantial
evidence ~ 5 billion years.
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Formation of a Solar Formation of a Solar SystemSystem
Solar Nebula – the nebula that formed into the solar system.
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OUT: Summarize the difference between terrestrial planets and gas giants.