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unit 2 lesson 1+2

vocab terms

TermDefinition
solar system consists of an average star we call the Sun, the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto
galaxy a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction
planet a celestial body moving in an elliptical orbit around a star.
ligth year a unit of astronomical distance equivalent to the distance that light travels in one year
star a fixed luminous point in the night sky that is a large, remote incandescent body like the sun
universes all existing matter and space considered as a whole; the cosmos. The universe is believed to be at least 10 billion light years in diameter and contains a vast number of galaxies
luminosty the intrinsic brightness of a celestial object (as distinct from its apparent brightness diminished by distance
appernet magnuitude the magnitude of a celestial object as it is actually measured from the earth
absolute magnitude the magnitude (brightness) of a celestial object as it would be seen at a standard distance of 10 parsecs.
yordani osorio
Created by: 4804064966
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