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Kirsch-Van Ch. 21

Chapter 21 Vocab Van

QuestionAnswer
How Bright a star appears to an observer on Earth Apparent Magnitude
The average distance between Earth and Sun, about 150 million km Astronomical Unit (AU)
Theory that the universe was originally a single dense sphere of hydrogen that exploded into a gigantic expanding cloud that eventually condensed into separate galaxies Big Bang theory
Massive objects in space whose gravitationsl forces are so strong that light rays cannot escape Black Hole
A group of stars that appears to form a pattern in the sky. Constellation
A group of millions, or even billions, of stars held together by gravity Galaxy
The distance a ray of light travels in one year, about 9.5 trillion km Light-year (LY)
The actual, or true, brightness of a star
A large cloud of gas and dust in space Nebula
The dense core that remains after a large star explodes Neutron Star
A star that flared into intense brightness Nova
An intensely bright object caused by the explosion of a massive red giant star. Supernova
Created by: dkirsch
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