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White dwarf

Adapted from Wikipedia · Explorer experience

The Crab Nebula is a beautiful cloud of glowing gas formed from an ancient star explosion, captured by the Hubble Space Telescope.

White Dwarfs

A white dwarf is a small, very dense star. Imagine a star that could fit inside a space about the size of the Earth, but it holds as much mass as our Sun! These stars are like tiny, strong lights in the sky.

Many stars, including ones like our Sun, will become white dwarfs after they run out of fuel. They cannot turn into denser objects like a neutron star or a black hole because they do not have enough mass. The closest known white dwarf to us is Sirius B, which is part of the bright binary star system called Sirius.

White dwarfs are made of a special kind of matter. Once they form, they stop all reactions that make stars shine and stay standing because of something called electron pressure. This makes them extremely dense. Even though they start very hot, white dwarfs cool down slowly over a very long time, sending their energy out into space.

Scientists have found many white dwarfs close to our solar system. Studying them helps us learn more about these interesting objects and how stars change over time. White dwarfs remind us that even after stars stop shining, they still have a lot to teach us about the universe.

Images

A diagram comparing the sizes of the stars IK Pegasi A, IK Pegasi B, and our Sun.
A diagram showing different types of white dwarfs, tiny dense stars, based on data from the Gaia space telescope. It helps scientists study how stars change over time.
A periodic table showing elements found in the atmospheres of white dwarf stars, helping scientists learn about distant planetary systems.
An artist's view of a white dwarf star surrounded by debris from its planetary system, showing how asteroids fall into a disk of dust around the star.
An artist's view of the giant planet WD 1856b orbiting its small white dwarf star.
Illustration showing the evolution of stars into white dwarfs.
An artist's depiction of HE 1523-0901, one of the oldest known stars in our galaxy, located about 7,500 light-years from Earth.

This article is a child-friendly adaptation of the Wikipedia article on White dwarf, available under CC BY-SA 4.0.

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