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20 Cards in this Set
- Front
- Back
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singularity
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A point of infinite density with no volume
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Nebula Theory Of Planet Formation
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1. Nebula forms from H and He
2. Nebula becomes swirling disc 3. Dust (Inner) and Ice (Outer) form rings 4. Gravity pulls dust and gas to form sun 5. Rings form Plantesimals 6. Plantesimal forms Earth 7. Moon forms from collision with Earth |
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8 Planets
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Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
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3 Dwarf Planets
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Ceres, Pluto, Eris
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Planet
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1. Orbits the sun
2. Large enough to be nearly round 3. Cleared its orbit of other objects |
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Dwarf Planets
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1. Orbit the sun
2. Large enough to be nearly round 3. Has not cleared orbit of other objects 4. Is not moon |
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Solar wind
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Blew away lighter gaseous material from inner solar system
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Asteroid Belt
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concentrated between Mars and Jupiter - never form planet because of gravitational pull of Jupiter
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Meteoroid
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Particle of dust or small chunk of debris in space
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Meteor
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Meteoroid burning up in earth's atmosphere
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Meteorite
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Meteoroid that has made it to earth's surface
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Origen of Meteorites
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1. Debris from comets
2. Debris from Asteroids 3. Planetary Debris ejected in past collisions |
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Comet
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Chunk of ice and rocky debris with a HIGHLY elliptical orbit
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Plasma Tail
Dust Tail |
always facing away from the sun
resulting from flying through atmosphere |
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Astronomical Unit
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The distance from the earth to the sun
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Short-Intermediate comets
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orbits of 200 yrs or less
start in Kuiper Belt (and Oort Cloud) |
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Long Period Comets
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orbit gtr than 200 yrs
start in deep Oort cloud |
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Meteor Shower
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great number of meteors that seem to come from one region of sky in short period of time
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What causes meteor showers?
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Earth's running through debris trail of comet's orbit -
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T or F : Meteors run into the path of the earth.
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False: Earth is running through the path of the meteor shower.
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