a white dwarf
I assume you mean a DWARF STAR. There are different types of dwarf stars; the white dwarfs are fairly hot - but the reason they are dim is that they have a very small surface area.
That might be a white dwarf.
As the name white dwarf implies, this is a small type of star, and it has less surface area from which to radiate light, so even if it is hot, and giving off lots of light per square mile, there are fewer square miles than in larger, non-dwarf stars, so there is less total light being emitted.
A small star that only gives off faint light and is relatively cool is likely a red dwarf star. These stars are much smaller and cooler than our Sun, but they are the most common type of star in the universe. Despite their dim appearance, red dwarfs can be very long-lived.
A supergiant star has an atmosphere that extends far from the star's center. On a surface area basis, square meters say, the surface is very dim. But since the size is so great the overall brightness is high. Betelgeuse is a good example. The outer atmosphere is so tenuous that there is actually a star orbiting within it. But it is so large that it shines brightly at the right shoulder of Orion.
This describes a white dwarf, which is a small, dense star that remains after a star has exhausted its nuclear fuel and shed its outer layers. White dwarfs emit heat and light as they slowly cool down over billions of years.
A Black star, or a dwarf star is commonly refered to as a star that is 'fading'. In fact, the star is starting to burn out as stars are like the sun, only smaller. They are small burning balls of gas.
The closest known Star to our sun is Proxima Centauri, a small dim red dwarf star around 4.2 light years away.
White Dwarf Stars are very hot, like a ball of fire. They are dim because they are small and very far away.
I assume you mean a DWARF STAR. There are different types of dwarf stars; the white dwarfs are fairly hot - but the reason they are dim is that they have a very small surface area.
A cold dead star is called a white dwarf. It is formed when a star has exhausted its nuclear fuel and collapsed under gravity, shrinking to a small, dense, and dim object.
stars that are dim probably have both a small mass and a larger radius.
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It depends on the size. Small, dim stars live much, much longer than large, bright ones. The expected lifetime of a star like the Sun as a main-sequence star is about 10 billion years.
A red dwarf star is hard to see because those stars are small and dim, their low luminosity made them hard to observe.
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