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Astrophysics

Across
A galaxy that is a flat disk without spirals
Sudden & intense variations in brightness of photosphere surface
Photons are absorbed here
Nuclear fusion and core is mostly helium
Study individual wavelengths of light
Part of the sun we see
Down
Ensemble of stars interacting through gravitational force
When 2 or more small nuclei fuse to make a bigger nucleus
True explosion of a star
74% of the gas on the sun