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| Answer |
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| 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 |
Cardio Block2anatomy
