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20 terms

ASTRONOMY CH 4 Stars, Galaxies & the Universe

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