What do white dwarfs and supergiants have in common?

Answer 1

They are essentially the same thing, a White dwarf is thought to become a black dwarf once the temperature has cooled. There are not thought to be any black dwarfs in the universe as it's currently too young.

Answer 2

A white dwarf is the remnant of non-massive stars that "shed" off their outer layers after depleting their nuclear fuel. All that remains is the core which glows white-hot until it cools down and fades out. They're about a few thousand kilometers across. A teaspoon of material in a white dwarf is about as heavy as a spoonful of syrup.

A Neutron star is the remnant of a supernova event

Answer 3

Apart from the colour :-)

Red dwarfs are very low mass stars with no more than 40% of the mass of the Sun. Consequently they have relatively low temperatures in their cores and energy is generated at a slow rate through nuclear fusion of hydrogen into helium via the proton-proton (PP) chain mechanism. Thus these stars emit little light, sometimes as little as 1/10,000th that of the Sun. Even the largest red dwarf has only about 10% of the Sun's luminosity

A white dwarf, also called a degenerate dwarf, is a small star composed mostly of electron-degenerate matter. Because a white dwarf's mass is comparable to that of the Sun and its volume is comparable to that of the Earth, it is very dense. Their faint luminosity comes from the emission of stored heat.

Answer 4

a white dwarf is the blue-white hot core of a star that is left behind after its outer layers have expanded and drifted out into space. and a neutron star are the remains of high mass stars.

so the diffrence between a white dwarf and a neutron star is that a white dwarf is just a piece of whats left and a neutron star are the pieces of high mass stars

Answer 5

A white Dwarf is a Blazing hot small star that takes billions, or millions, of years to cool, a cooling White Dwarf is a White Dwarf that is losing some temperature as it ages, and a Black dwarf is a Dead, really cold star. The Black Dwarf is the total opposite of a White Dwarf.

Answer 6

Larger stars have a large surface area to see. They aren't necessarily hotter or brighterwhen comparing a comparable size.
Stars brightness to us on earth depends on how far away from us they are and their total luminosity which is a combination of size and energy output. A red star of the same volume as a white star would not be as bright.

Answer 7

Because of the size difference. A red giant is huge when compared to a main sequence star, this gives it a much higher luminosity as it approaches the end of its life. The mass of a red giant maybe comparible to a much smaller main sequence star, but size is much bigger, so its overall density is very low.

Answer 8

well, white dwarfs are red giants that have imploded and become very dark and small, only about the size of earth. Red giants are stars that are very, very large and bright, but will eventually turn into a white dwarf.

Answer 9

A white dwarf is the remnant of a star, a collapsed mass that is so hot it radiates heat and light. It is not active though, unlike our sun or any other star in its main sequence that is physically burning hydrogen fuel, converting mass to energy. A white dwarf is emitting stored energy, while our sun is still making energy through nuclear fusion.

Answer 10

A white dwarf might be hotter, but a red giant is much, much bigger so it has a larger surface to radiate more radiation. So It will appear much brighter than a white dwarf.