What happens to a star when hydrogen burns out?

Answer 1

The star first expands into a red giant (or a supergiant star if the original star was a giant star) and then explodes in a fusion flash (sun-size star), nova (slightly larger), or supernova (for a supergiant).

Answer 2

When a star has fused all it's hydrogen in its core, it expands for form a Red Giant. The hydrogen in its outer layers then begins to fuse. Once all the hydrogen is gone, the core is usually compressed enough to start fusing helium, then heavier elements, and so on.

Answer 3

When a star uses the hydrogen in its core it will start burning hydrogen in a shell around the core and become a red giant. After that the star will either collapse into a white dwarf or start fusing helium, depending on its mass.

Answer 4

When the sun runs out of hydrogen it will start fusing helium into carbon It moves to the next stage of fusion: burning higher elements. After that stage, it will blast away its outer atmosphere as a planetary nebula while its core will collapse into a white dwarf.

Long before the hydrogen runs out, the sun will have expanded to a red giant - extending in size to beyond the orbit of Venus. The intense solar radiation will strip away the Earth's atmosphere so, between the heat and the absence of an atmosphere, the Earth will have become an uninhabitable planet.

Answer 5

it explodes and turns into a supernova or blackhole

Answer 6

The core shrinks while the rest of the star expands.

Answer 7

It will contract until it gets hot enough to fuse helium into heavier elements.

Answer 8

It uses helium.