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Astronomy Vocabulary

Astronomy terms

Theory that states that the universe began with a tremendous explosion about 15 billion years ago The Big Bang Theory
All space and the matter that space contains Universe
A large group of stars in space Galaxy
A flattened disk of stars with spiral arms and a central bulge that contains both young and old stars Spiral Galaxy
Massive groups of old stars that look like spheres or elongated oval shapes with bright centers Elliptical Galaxy
Group of stars that have an irregular structure and do not fit into the other categories Irregular Galaxy
A large cloud of dust and gas in space where new stars are formed Nebula
Huge bright ball of gas and dust in space Star
Where stars spend most of their active life fusing hydrogen to helium and form a diagonal pattern down the center of the H-R diagram Main Sequence Star
A star that expands and cools once it runs out of hydrogen Red Giant Star
A small hot star near the end of its life; the left over center of an old star White Dwarf
The next stage in a star's life cycle after a white dwarf when the star has 'burned out' and no longer shines Black Dwarf
The death of a star by a tremendous explosion which releases huge amounts of energy Supernova
A star that forms after a supernova in which nearly all the particles have become neutrons Neutron Star
A spinning neutron star that emits rapid pulses of light Pulsar
#An object that forms after a supernova with gravity so strong that the escape veloxity is greater than the speed of light Black Hole
Hertzsprung-Russsel diagram; a graph that shows the relationship between a star's temperature and absolute magnitude H-R Diagram
A starlike source of light that is extremely far away and one of the most powerful sources of energy in the universe Quasar
Groups of stars within galaxies Star Cluster
Created by: nmerson