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List of vocab words of the universe formation

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
Define Asteroid   rocky remnantof the early solar system found mostly in the asteroid belt.  
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Define Asteroid Impact   An impact event is the collision of a large asteroid with the earth or another planet.  
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Define Galaxy   A system of millions/billions of stars together with gas and dust held together by a gravitational attraction.  
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Define hydrogen   A colorless, highly flammable, odorless gas.  
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Define Mass   a measure of the resistance an object has to change in its velocity.  
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Define Milky Way   Our galaxy, on Orion's Arm  
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Define Orbit   The curved path a celestial object around a star, planet, or moon.  
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Define Planet   A celestial body moving in an elliptical orbit around a star.  
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Define revolution   the curved path of a celestial ovject around the sun.  
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Define rotataion   the action of rotating around and axis or center.  
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Define Solar System   The collectionn of planets and their moons in orbit around a sun together with smaller bodies like asteroids, meteroids, and comets.  
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Define Sun   A medium sized star.  
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Define Universe   All exting matter and space considered as a whole.  
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What is the age of the universe?   13.7 billions years old.  
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Define Astronomical Distance   Distance between Earth and the Sun.  
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What is the Big Bang Theory?   The theory that the universe began as a point and has been expanding since.  
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Define Cosmic Microwave Background.   The cooled remnant of the hot big band that fills the entire universe and can be observed today.  
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Define Expansion of the universe   The observation in physical cosmology that the velocity at which various galaxies are receding from the Earth.  
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What evidence is there of the Big Bang Theory?   Expansion of the Universe and Cosmic Microwave Background.  
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Define Ga   Billiono of Years ago.  
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Define light year   A measurement, not time. The distance light travels in one year.  
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Define Nebula   The formation of a star that begins with a cloud of interstellar gas and dust that collapses on its self  
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Define Nova   Star stage of Explosion  
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Define Nuclear fusion   H->He  
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What is the speed of light?   300,000 km/sec 186,000 miles/sec  
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How does a star form?   When dense parts of molecular clouds collapse into a ball of plasma to form a star.  
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Define Protostar   A disk shape with a hot condensed object in the center.  
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Define Astronomy   The branch of science that deals with celestial objects, space, and the physcial universe as a whole.  
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Define cosmology   the study of the universe, it's nature, origin, and evolution.  
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Define Celestial   Relating to the sky, or outer space as observed in astronomy.  
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