Question

When a star's core collapses inward while the outer layers spread and cool, what "colorful" celestial body forms?

Answer 1

red giant

Eventually a main sequence star will use up all of its hydrogen. It then starts to fuse helium atoms into larger elements like carbon. At this time, the stars core will collapse inward. The star's outer layers will spread out and cool. The result is a larger star that is cooler on the surface, and red in color. The star is now a red giant .