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ASTRONOMY CH 4 Stars, Galaxies & the Universe
A group of stars that form a pattern in the sky
an instrument that separates light into colors and makes an image of the resulting spectrum
the brightness of a star as seen from earth
the brightness a star would have if it were at a standard distance from earth
The distance that light travels in one year
the apparent change in position of an object when seen from different places
a huge cloud of dust and gas in space
a contracting cloud of gas and dust; the earliest stage of a star's life
a faint star of enormous density
a star that suddenly gets very bright and explodes
a star that has collapsed under its own gravity
a region of space resulting from the collapse of a star
a system of two stars that revolve around each other under their mutual gravitation
(astronomy) a collection of star systems
a starlike object that may send out radio waves and other forms of energy
a method of writing very large or very small numbers by using powers of 10
the initial explosion that resulted in the formation and expansion of the universe
The observation that the farther away a galaxy is, the faster it is moving away.
All matter and energy that exists in space
a rapidly spinning neutron star that produces radio waves