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Astronomy Vocabulary
Astronomy terms
Question | Answer |
---|---|
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 |