Big Bang Theory | Orbits | Stars | Relationships | Potpourri |
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What is a galaxy
A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
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What is an ellipse
Planets orbit the sun in an orbit of this shape.
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What is a nebula
A cloud of gas and dust that is the beginning of a star.
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What is decreases.
As distance increases, gravitational force does this.
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What is hydrogen
The most abundant element found in main sequence stars.
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What is a redshift
A decrease in frequency due to movement away from an observer.
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What is zero
The eccentricity of a perfect circle.
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What is the core
Where fusion occurs in main sequence stars.
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What is directly proportional
Mass and gravity have this type of relationship
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What is increases
As the velocity of a planet/satellite's orbit increases, this happens to its orbital period.
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What is open, closed, and flat
The three possible fates of the universe.
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What is mass and distance
The two things that gravity depends on.
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What is a supernova
An explosion that occurs at the end of a massive star's life-cycle.
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What is decreases
As the wavelength of light from a star increases, its frequency does this.
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What is aphelion.
The position on a planet's elliptical orbit where it is moving the slowest.
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What is a blueshift
A decrease in wavelength due to movement toward an observer.
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What is one year
The orbital period of the Earth.
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What is a red giant
What the sun will become when it is done fusing hydrogen in its core.
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What is increases
For stars on the main sequence, as the star gets hotter, its brightness does this.
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What is it will continue to expand forever
If the fate of the universe is an open universe, this will happen.
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What is redshifted galaxies and cosmic background radiation
Two pieces of evidence for the big bang theory.
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What is the perihelion
The point in an elliptical orbit where the planet is moving the fastest.
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What is white dwarf
The type of star that the sun will be at the END of its life-cycle.
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What is smaller.
Compared to a less massive planet orbiting a star, a more massive planet orbiting the same star's major axis will be this.
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What is c/a.
How eccentricity is calculated.
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