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40 Cards in this Set
- Front
- Back
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what is astronomy?
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the study of matter and energy in the universe, especially where they are concentrated.
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What sciences is astronomy a blend of?
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physics, geology, meteorology, chemistry, biology, MATH
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10^1
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10
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10^2
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100
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10^3
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1000
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10^0
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1
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10^-1
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0.1
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10^-2
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0.01
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What is the solar system composed of?
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star(s), planets, minor bodies held by gravity
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What is in OUR solar system?
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Sun, 8 planets, moons, comets, asteroids
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What is a galaxy?
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a collection of stars, gas, dust held by gravity
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stars are in the Milky Way galaxy?
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~400 billion stars
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What is the universe composed of?
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~100 billion galaxies distributed in clusters held by gravity
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What is the lagoon nebula?
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a star-forming region in space, about 5000 LYs away
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What is a nebula?
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cloud of gas and dust
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What is a lightyear
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the distance light travels in a year
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What is the formula for distance?
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D= velocity*time
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What is the marer of a good theory?
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It has repeatable results
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How far are the Earth and Moon apart?
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400,000 km
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How far are the Earth and the Sun apart?
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150 million km
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What does the celestial sphere depict?
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It depicts the sky from a specific location @ Earth. Earth at the center and the stars are equidistant, with the Sun and stars moving around Earth
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What are circumpolar stars?
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the stars that move around the celestial pole
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What is an ecliptic?
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path the sun makes as it moves through the stars
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What does rotation mean?
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the spinning motion (ex. of the Eart) about an axis.
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How often is the rotation of the earth?
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1x/24 hrs
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What is a revolution?
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the orbital motion of one body around another
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How often does the Earth revolve around the Sun?
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1x/ 365.25 days
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When are various stars visible?
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At various times of the year
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How does the SUn appear to move over the year?
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It seems to move w/ respect to the stars through the constellations of the zodiac
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What does the Sun's annual apparent motion trace out?
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the ecliptic
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What does the celestial sphere depict?
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It depicts the sky from a specific location @ Earth. Earth at the center and the stars are equidistant, with the Sun and stars moving around Earth
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What are circumpolar stars?
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the stars that move around the celestial pole
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What is an ecliptic?
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path the sun makes as it moves through the stars
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What does rotation mean?
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the spinning motion (ex. of the Eart) about an axis.
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How often is the rotation of the earth?
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1x/24 hrs
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What is a revolution?
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the orbital motion of one body around another
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How often does the Earth revolve around the Sun?
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1x/ 365.25 days
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When are various stars visible?
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At various times of the year
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How does the SUn appear to move over the year?
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It seems to move w/ respect to the stars through the constellations of the zodiac
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What does the Sun's annual apparent motion trace out?
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the ecliptic
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