Question

what are the four main parts of a spiral galaxy?
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a halo, bulge, dish, and arms
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stars, moons, planets and asteroids
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hydrogen, helium, nitrogen, and light metals
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ebulae, black hole, dark matter, and cluster

Explanation:

A spiral galaxy has a halo (a diffuse outer region), a bulge (a central dense region), a disk (where most stars, gas, and dust are concentrated), and spiral arms (where star - formation is common). The other options list celestial bodies or substances that are components within a galaxy but not the main structural parts of a spiral galaxy.

Answer:

a halo, bulge, dish, and arms