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| used to measure a stars distance from Earth; shows the apparent change in the position of an object when viewed from Earth |
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| all of the different types of electomagnetic waves |
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| through nuclear fusion in its core |
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| stars begin their lives as |
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| force that pulls together matter in stars |
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| distance light travels in a year |
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| theory astronomers developed to explain formation of the universe |
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| Our univers is about how old? |
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| this evidence supports the Big Bang Theory |
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| most galaxies are moving away from eachother |
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| Conditions required to support life on Earth |
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| liquid water, oxygen and temperate climate |
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| chemical compsition of stars are determined using |
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| there is enough fuel remaining in the sun for it to last |
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| explosion of a dying giant or supergiant star |
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| Pluto is no longer considered a planet |
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| it is too small and its orbit does not match those of the other planets |
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| usually come from comets or asteroids |
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| The heliocentric system gained support |
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| when Galileo observed that venus went through similar phases like our moon |
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| two factors that keep planets in orbit |
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| Earth is the only planet known to have this |
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| Kepler discovered mar's orbit is |
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| distance between the crest of one wave and the crest of another wave |
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| objects in motion remain in motion |
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| force that pulls moon toward Earth |
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| Surface of the largest planets are |
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| chuncks of ice and dust that have long elliptical orbits |
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| galaxies are moving away from eachother |
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| name the planets in order from the sun out |
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| MERCURY, VENUS, EARTH, MARS, ASTEROID BELT, JUPITER, SATURN, URANUS, NEPTUNE, (PLUTO) |
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| not considered planets because they are too small; revolve around the sun between Mars and Jupiter |
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