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29 Cards in this Set
- Front
- Back
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Ptolemy's universe |
Earth at the center, planets and sun orbit Earth |
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Aristarchus' universe |
Sun at the center, Earth orbits sun and rotates on axis |
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Galileo achievements |
homemade telescope in 1609, discovered mountains on the moon, sunspots, rings of saturn, moon's of jupiter |
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Kepler's 1st law of planetary motion |
Planets orbit the sun in an ellipses with the sun at one focus |
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Kepler's 2nd law of planetary motion
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A line connecting a planet to the sun sweeps out equal areas in equal time
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Kepler's 3rd law of planetary motion |
The square of the planet's orbital period is proportional of the cube of its distance from the sun |
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Discovery of Uranus |
1781 William Herschel |
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Discovery of Neptune |
1846 |
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Discovery of Pluto |
1930 |
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age of the solar system |
about 4.5 billion |
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What kind of planets form in the outer regions of solar systems?
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Large gas planets because the material condenses quicker
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What kind of planets form in the inner regions of solar systems? |
Only solid material can survive so small terrestrial planets form |
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How is the sun fueled?
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Fuses 4.5 billion tons of Hydrogen a second
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What is Mercury's core made of? |
Iron because of a weak magnetic field |
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Only space probe to visit Mercury |
Mariner |
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Venus' atmosphere |
Mostly CO2, what is called runaway greenhouse effect |
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What causes Jupiter's strong magnetic field? |
metallic hydrogen in the core surrounded by liquid hydrogen |
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The biggest moon in the solar system |
Saturn's moon Titan |
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Least dense planet in the solar system |
Saturn |
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Uranus' atmosphere |
Hydrogen, helium, and methane that causes blue color |
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Where are there nitrogen geysers in the solar system? |
Neptune's moon Triton |
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Neptune's atmosphere |
Similar to Uranus but more methane |
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Where in the solar system is Pluto? |
Kuiper belt |
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What is the current classification of Pluto? |
Dwarf Planet |
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When was Pluto downgraded? |
2006 |
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What defines a planet according to the IAU? |
Must orbit the sun, must be large enough to become spherical, must clear out its orbit of other objects |
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Which of the IAU planetary definitions does Pluto not fit? |
Pluto hasn't cleared its path of other objects |
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Where is the asteroid belt? |
Between Mars and Jupiter |
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Famous Leonids meteor shower |
1833 estimated 100,000 meteors an hour |
