What happens when all of the hydrogen in a star gets used up?

What happens when all of the hydrogen in a star gets used up?

When the core hydrogen is used up and no more nuclear fusion occurs, the star’s outer stellar layers expand and the core shrinks. At this point, the star becomes a Subgiant Star . The star’s outer layers continue to expand and the star brightens. The star then becomes a Red Giant Star .

What do main sequence stars become when they run out of hydrogen to burn?

When stars run out of hydrogen, they begin to fuse helium in their cores. This is when they leave the main sequence. High-mass stars become red supergiants, and then evolve to become blue supergiants. It’s fusing helium into carbon and oxygen.

What happens to a main sequence star like the sun after the hydrogen runs out?

Initially the energy is generated by the fusion of hydrogen atoms at the core of the main-sequence star. Once a star like the Sun has exhausted its nuclear fuel, its core collapses into a dense white dwarf and the outer layers are expelled as a planetary nebula.

What happens after most the hydrogen in the core of a star is used up to produce energy?

As the main sequence star glows, hydrogen in its core is converted into helium by nuclear fusion. When the hydrogen supply in the core begins to run out, and the star is no longer generating heat by nuclear fusion, the core becomes unstable and contracts.

What is the most massive star in the universe?

R136a1. The star R136a1 currently holds the record as the most massive star known to exist in the universe. It’s more than 265 times the mass of our Sun, more than double most stars on this list. Astronomers are still trying to understand how the star can even exist.

What happens in the first stage of a star much bigger than the sun’s death?

Stars More Massive Than the Sun When the core runs out of hydrogen, these stars fuse helium into carbon just like the sun. However, after the helium is gone, their mass is enough to fuse carbon into heavier elements such as oxygen, neon, silicon, magnesium, sulfur and iron.

What are the 7 main types of stars?

There are seven main types of stars. In order of decreasing temperature, O, B, A, F, G, K, and M. This is known as the Morgan–Keenan (MK) system.

What happen if a low massive main sequence star runs out of hydrogen fuel?

When a main sequence star begins to run out of hydrogen fuel, the star becomes a red giant or a red super giant. THE DEATH OF A LOW OR MEDIUM MASS STAR After a low or medium mass or star has become a red giant the outer parts grow bigger and drift into space, forming a cloud of gas called a planetary nebula.

What happens when a star bigger than the sun’s core collapses?

If the core is larger, it will collapse into a black hole. To turn into a neutron star, a star must start with about 7 to 20 times the mass of the Sun before the supernova. Only stars with more than 20 times the mass of the Sun will become black holes.

What is the largest star in the universe?

UY Scuti
The largest known star in the universe is UY Scuti, a hypergiant with a radius around 1,700 times larger than the sun.

What is the hottest star color?

Blue stars
White stars are hotter than red and yellow. Blue stars are the hottest stars of all.

How many Earths can fit in the biggest star?

Complete answer: We need to know that the diameter of VY Canis Majoris is 155000 times that of our Earth. Let us assume that nnumbers of Earth can be fitted into VY Canis Majoris. Therefore, we can conclude that 7.5477×1010Earths can be fitted into VY Canis Majoris.

How are stars burned in the main sequence?

Stars on the main sequence burn by fusing hydrogen into helium. Large stars tend to have higher core temperatures than smaller stars. Therefore, large stars burn the hydrogen fuel in the core quickly, whereas, small stars burn it more slowly.

What happens when a star reaches the end of its life cycle?

Eventually, a main sequence star burns through the hydrogen in its core, reaching the end of its life cycle. At this point, it leaves the main sequence. Stars smaller than a quarter the mass of the sun collapse directly into white dwarfs.

What happens to the core of a star?

Only the core is hot enough for fusion. What happens to the star’s core as the hydrogen there is used up? A)… Nothing. It just turns to helium. B)…It expands and cools. C)…It contracts and cools. D)…It contracts and heats. E)…As the helium accumulates the core rises to the surface of the star and escapes into space.

How does a young star become a stable star?

The young star is now stable in that the outward pressure from hydrogen fusion balances the inward pull of gravity. The star enters the main sequence; where it lies on the main sequence depends upon its mass. Now that the star is stable, it has the same parts as our sun: