9 terms

Astronomy 1

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Terms in this set (...)

milky way
The galaxy of which the sun and the solar system are a part and which contains the myriads of stars.
scientific theory
A well tested concept that explains a wide range of observations.
solar system
The collection of eight planets and their moons in orbit around the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.
universe
All of space and everything in it.
big bang theory
Theory that the initial explosion that resulted in the formation and expansion of the universe.
galaxy
A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity.
gravity
A force that pulls objects towards each other.
geocentric
A model of the universe in which Earth is at the center of the revolving planets and stars.
heliocentric
A model of the solar system in which Earth and the other planets revolve around the sun.

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