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Penumbra An outer shadow
Revolution A year is a measurement of 1 revolution around the Sun
Rotation The movement that a planet does in space
The Big Bang This event might have triggered the expansion of the galaxy
Outer Planets Planets that are made of gases
Binary Stars Two stars that orbit each other
Pulsar A type of neutron star that emits pulses of light
Red Giant After all the H2 is used up in fusion, a yellow star begins
Nebula A vast cloud of gas and dust where stars and planets may be formed
Planetismals The nebula overtime spins in a disk shape, and some gases compress
Created by: mtx