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28 Cards in this Set
- Front
- Back
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meteorites |
small space rocks that reach the earths surface |
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big bang theory |
most excepted theory of how the universe was formed |
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magnitude (strength) and direction |
two things a vector indicates about a force |
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elliptical |
shape of a planets orbit |
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period of rotation |
the motion that determines the length of a planets day |
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between mars and jupiter |
location of the astroid belt |
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Copernicus |
the scientist who proposed the firdt heliocentric (sun centered) model of the solar system |
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inertia |
an objects tendency to resist changes in its motion |
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mass |
determines the amount of gravitational force an object possesses |
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gravity and inertia |
two factors that cause the elliptical orbit of a planet around the sun |
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Ptolemy |
the astronomer who believed the earth was the center of our solar system and the planets orbited in perfect circles |
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light years |
the unit when measuring vast distances in space |
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mercury, venus, earth, mars |
solid, rocky planets |
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jupiter, saturn, uranus, neptune |
gaseous planets |
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constellation |
a pattern in the night sky |
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the Nebular theory |
the most excepted theory of how our solar system formed |
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4.5 billion years |
the estimated age of our solar system |
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the Milky Way |
the name of the galaxy in which our star system is located |
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nebula |
massive clouds of gas and dust considered the birth place of stars |
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meteor |
object also known as a shooting star than can be seen streaking through Earth's atmosphere |
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Kepler |
mathematician who determined the planets orbits were elliptical not circular |
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Newton |
developed the laws of motion and heloed prove a planets orbit is elliptical due to gravity and inertia |
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period of revolution |
the motion that determines the length of a planets year |
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Earth |
third planet from the sun |
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mass |
determines the amount of surface gravity |
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100s of billions |
best estimate of the number of stars in a galaxy |
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mercury |
if a planet travels faster the closer it is to the sun, which planet in our solar system has the greatest orbital velocity? |
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meteoroid |
smaller piece of rock and metal in outerspace |
