Isn t a brown dwarf a planet and not a star, so what is it?

A brown dwarf is not a star, but it is a gas planet with a structure similar to a star, and its mass is only twice the mass of the sun, because the mass is too small to carry out nuclear fusion, because its surface temperature is lower, so the visible light is lower.

It's just a very large meteorite, so it's neither a planet nor a star, so it's a special existence in the universe.

Brown dwarfs are neither stars nor planets, but they fall somewhere in between, sharing common features such as the Sun and an atmosphere like Jupiter.

The dwarf planets are Pluto, Ceres, Eris, Ornith, Co-Worker, and Haumea. Dwarf planets, or "dwarf planets", are between planets and asteroids in size, orbit stars, are massive enough to overcome solid gravity to achieve a hydrostatic equilibrium (nearly spherical) shape, do not empty other celestial bodies in their orbits, and are not planets.

Pluto was discovered by astronomers at the Lowell Observatory in the United States in 1930 and has been regarded as one of the nine planets in the past. It is the smallest one of the planets, smaller than our moon, and its orbital plane is much larger than other planets in terms of tilt angle relative to the ecliptic, coupled with the eccentricity of the orbital elliptical orbit, so that its perihelion is within the orbit of Neptune, so the question of whether Pluto is considered a planet has been raised and discussed for several years, and it was renamed a dwarf planet after the new planetary definition in 2006.

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Analysis: A dwarf planet is a celestial body that has enough mass like a planet and is spherical, but cannot clear other objects in its orbit

A dwarf planet must meet four conditions: the object must orbit the Sun; It has a large enough mass to be able to rely on its own gravity to achieve an approximate spherical shape through hydrostatic equilibrium; The object does not have a dominant role in the orbital region and is disturbed by adjacent objects in orbit; The object is not a satellite. Accordingly, Pluto, Ceres, Charon, and 2003UB313 (Zena) will be classified as dwarf planets.

The International Astronomical Union will establish a procedure for the assessment of celestial bodies close to the boundaries of dwarf planets and other classifications. All other celestial bodies that revolve around the Sun are called "solar system small bodies", such as comets and asteroids.

Dwarf planets, or "dwarf planets", are somewhere between planets and asteroids, orbit stars, are massive enough to overcome solid gravity to achieve a hydrostatic equilibrium (nearly sphere-like) shape, do not emptie other objects in their orbits, and are not moons.

Dwarf planets are smaller than planets, but still massive enough to keep themselves essentially spherical. They also revolve directly around the sun. Because dwarf planets fail to clear the area near their orbit by gravity during their formation, they are "shorter" than planets.

As of July 2012, only five dwarf planets have been confirmed, among which Pluto, Archaeo, and Xì are all famous.

Dwarf planets, or "dwarf planets", are between planets and asteroids, orbit the Sun, and are massive enough to overcome solid gravity to achieve hydrostatic equilibrium, nearly spherical in shape.

The designation and definition of dwarf planets were confirmed at the 26th International Astronomical Congress held in Prague, the capital of the Czech Republic on 24 August 2006

1. A celestial body orbiting a star;

2. There is enough mass to overcome the solid gravity of the wheel with its own gravity, so that it can achieve the shape of hydrostatic equilibrium;

3. Failure to clear other small objects in approximate orbits;

4. It is not a satellite of the planet Luxin, or other non-stellar celestial bodies, but it is not large enough for nuclear fusion to occur within it.

The light in the universe mainly comes from the stars. They are both gas balls that produce energy through central nuclear fusion. Stars are formed by agglomeration of clumps of gas and dust in nebulae.

These clumps also sometimes form binary stars or star clusters. Stars vary in color, brightness surface temperature, brightness, and lifetime due to their initial mass. The largest stars are giants and supergiants.

They are the hottest and brightest stars, but they can only exist for a few million years. Small, faint, red, low-mass stars (there are many of them) that can burn for billions of years are called red dwarfs. A smaller category is brown dwarfs.

They are failed stars, not big enough and not hot enough to sustain the kind of nuclear fusion that occurs in stars, with only a faint glow. Perhaps most of the normal matter in the universe exists in this form.

The supergiant Betelgeuse is 425 light-years away, but because it's so big, it appears as a disk.

Terrier I (Constellation Pastorus) is a binary star system consisting of a bright orange-yellow host star buried in Orange and a faint bluish companion star.

Globular clusters like M3 above are ancient objects orbiting the Milky Way. M3 contains 500,000 stars.

The highlight on the right side of the image is a brown dwarf called Gliese 229b. It circled the huge, bright red giant Gliese 229 next to it.