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Planets usually refer to celestial bodies that do not emit light and surround the stars. Its direction of revolution is often the same as the direction of rotation of the star. Generally speaking, the planet needs to have a certain mass. The mass of the planet should be large enough and similar to a spherical shape. It cannot itself undergo nuclear fusion reaction like a star. Generally, the lower the mass, the lower the temperature of the star. Although many stars with lower quality than the sun can continue to undergo thermonuclear fusion, many of the original stars cannot evolve into stars if they are of lower initial mass. These "failed" stars are the "brown dwarfs" we usually understand. The current classification criteria define their mass range to be 7-75 times the mass of Jupiter.