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Stellar life

Across
Flattened disc of matter with increasing temperatures inside; second stage of star's life.
Incredibly dense ball of neutrons that forms after a star contracts after a supernova.
Hot, dense, small core that is left after the star collapses inward.
A stage in which nuclear fusion provides energy for the star to shine.
Stage of a star's life when helium fusion causes the star expand.
The simplest gas that makes up about 70% of nebula.
Created after supernova explosion when leftovers are too masive to form a neutron star.
The cloud of dust and gas.
Down
__ nebula - the core of a star that illuminates the outer gases.
Force that causes everything to be pulled inward.
Dead star.
Explosion of a giant or a supergiant that releases a tremendous amount of energy.
Nuclear ___ - process of combining two smaller nuclei into a bigger one.
An explosion of a white dwarf that may cause the star to become thousands times brighter than the sun.