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unit 2

QuestionAnswer
solar system is the collection of large and small bodies that orbit our central star, the sun.
planet is a spherical body that orbits the sun
star is a large celestial body that is composed of gas and emits light
galaxy is a large collection of stars, gas, and dust that is held together by gravity
light-year is the distance that light travels through space in 1 year
universe can be defined as space and all the matter and energy in it. However, this definition does not tell us about the structure of the universe
apparent magnitude is the measure of a star’s brightness as seen from Earth
luminosity they mean the actual brightness of a star.
absolute magnitude is a measure of how bright a star would be if the star were located at a standard distance.
Created by: user-1979211
 

 



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