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Stars list 1
| Term | Definition |
|---|---|
| nebula | large cloud of gas and dust spread out in an immense volume |
| protostar | a contracting cloud of gas and dust with enough mass to form a star |
| nuclear fusion | the process by which atoms combine to form heavier atoms |
| neutron star | the remains of high-mass stars. It may contain as much as 3 times the mass of the sun but be only about 25 kilometers in diameter, the size of a city. They are even smaller and denser than white dwarfs. |
| pulsar | spinning neutron stars |
| black hole | an object with gravity so strong that nothing, not even light, can escape. |
| white dwarf | the blue-white core of the star that is left behind cools and becomes a white dwarf |
| supernova | this is a sudden explosion.It occurs when a star called a supergiant runs out of fuel. |
| mass | the measure of the amount of matter in an object |
| density | how much mass a substance has in a given space |