What causes the outward pressure that balances the inward pull of gravity in a star?
The outward pressure exerted by hot gas balances the inward pull of gravity.
What inevitably forces a star like the sun?
What inevitably forces a star like the Sun to evolve away from being a main sequence star? Helium builds up in the core, while the hydrogen burning shell expands. Just as a low-mass main sequence star runs out of fuel in its core, it actually becomes brighter.
What happens when a star bigger than the sun’s core collapses?
The fate of the left-over core depends on its mass. If the left-over core is about 1.4 to 5 times the mass of our Sun, it will collapse into a neutron star. If the core is larger, it will collapse into a black hole. Only stars with more than 20 times the mass of the Sun will become black holes.
What determines when a star becomes a main sequence star?
Stars start their lives as clouds of dust and gas. But if the body has sufficient mass, the collapsing gas and dust burns hotter, eventually reaching temperatures sufficient to fuse hydrogen into helium. The star turns on and becomes a main sequence star, powered by hydrogen fusion.
What situation does a star becomes unstable?
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.
Which is known as the biggest stars in the universe?
The largest known star in the universe is UY Scuti, a hypergiant with a radius around 1,700 times larger than the sun.
Which of the following is the most common type of star?
A red dwarf is the smallest and coolest kind of star on the main sequence. Red dwarfs are by far the most common type of star in the Milky Way, at least in the neighborhood of the Sun, but because of their low luminosity, individual red dwarfs cannot be easily observed.
What is the typical age for a globular cluster associated with our Milky Way?
What is the typical age for a globular cluster associated with our Milky Way? 10-12 Billion Years.
What happens when a star like the Sun exhausts its core hydrogen supply?
What happens when a star like the sun exhausts its core hydrogen supply? Its core contracts, but its outer layers expand and the star becomes bigger and brighter. Hydrogen fusion in a shell outside the core generates enough thermal pressure to push the upper layers outward.
What happens to a star after a supernova?
The remnants of the stellar core which are left after the supernovae explosion will follow one of two paths: neutron star or black hole.
What would happen if the biggest star explodes?
An explosion of a nearby star might leave Earth and its surface and ocean life relatively intact. But any relatively nearby explosion would still shower us with gamma rays and other high-energy radiation. This radiation could cause mutations in earthly life.
What are the 7 types of stars?
There are seven main types of stars. In order of decreasing temperature, O, B, A, F, G, K, and M. O and B stars are uncommon but very bright; M stars are common but dim..
What are the two conditions required for a star to be on the main sequence?
A main sequence star is powered by fusion of hydrogen into helium in its core. Fusion is stabilized by a natural pressure-temperature thermostat. High-mass main sequence stars have shorter lifetimes than low-mass main sequence stars.
Which star spends the longest time as a main sequence star?
Science Chapter 26
|Which kind of star is most likely to spend the longest time on the main sequence?||a low-mass red star|
|Low-mass and medium-mass stars eventually turn into _______.||white dwarfs|
|What is a spinning neutron star emitting radio waves?||pulsar|
|The sun’s major source of fuel is _____.||hydrogen|
Do heavier stars live shorter lives?
A star’s life expectancy depends on its mass. Generally, the more massive the star, the faster it burns up its fuel supply, and the shorter its life. The most massive stars can burn out and explode in a supernova after only a few million years of fusion.