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28 Cards in this Set
- Front
- Back
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What is a star? |
object in space made of burning gasses and plasma which produce their own light and heat |
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What is Nuclear Fusion?
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the process by which stars produce light and heat. (2 atoms combine to form 1 atom) |
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What is a galaxy?
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a large group of stars, gas and dust held together by gravity |
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Gradually what is happening to galaxies?
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they are spreading apart
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What did Edwin Hubble Notice?
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-galaxies were getting farther apart |
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What is the Big Bang Theory? |
10-20 billion years ago tremendous explosion started the expansion of the universe from single point |
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In which galaxy are we located? |
In the Milky Way |
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Astronomy is... |
the study of the universe |
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The largest cosmic classification is |
universe |
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Solar systems are smaller than _________ but made up of ________, ________, and ________. |
galaxies stars, planets, moons |
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The Nebular hypothesis explains... |
the formation of solar systems. |
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What is Earth's rotation and what does it cause? |
Spinning on its axis, causes day and night |
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What is Earth's revolution and how does it take? |
Orbit around the Sun and takes one year |
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The motion that causes the change in direction of our Northern axis is called... |
precession |
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The motion that causes a slight wobble in the Earth's axis is called.... |
nutation |
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The true center of our solar system is... |
the barycenter (very close to the Sun) |
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When the Earth is closest to the Sun it is called _________, farthest point away is called _______. |
Perihelion, aphelion |
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When the Moon is closest to the Earth it is called _________, farthest point away is called _______. |
Perogee, Apogee |
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Sun, Moon, Earth alignment would cause a... |
solar eclipse |
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Sun, Earth, Moon alignment would cause a... |
lunar eclipse |
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Kepler's 1st law states that planets orbit in what shape? |
Ellipse |
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Kepler's 2nd law states that planets sweep equal area in what? |
Equal time |
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Kepler's 3rd law states that the closer a planet's orbit to the Sun... |
The shorter the orbital period |
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The tilt of Earth's axis causes which phenomenon? |
The Seasons |
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During a new or full moon, there is a large difference in high and low tide which is called |
spring tide |
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During quarter moons, there is a small difference between high and low tide which is called |
neap tide |
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The waves on the electromagnetic spectrum in order of smallest to largest: |
Gamma rays, X-rays, ultra violet, visible light, infrared, radio waves (radar, microwave, tv, fm, am) |
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The Doppler effect causes a _______ shift when an object is moving towards you, and a ______ shift when moving away. |
Blue, red |
