Celestial bodies mainly include the sun, planets, satellites, asteroids, comets, meteoroids and interplanetary matter in the solar system, stars, nebulae, clusters, interstellar matter and intergalactic matter in the Milky Way, among which the most basic step types are stars and nebulae.
Stars, planets in the universe, except for stars that don't shine, the sun is the closest star to the earth.
The solar system is centered on the sun, and the nearest star is proxima centauri. The order of the eight planets from near to far from the sun is: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Mercury: The planet closest to the sun has the fastest revolution speed, the smallest volume and the largest temperature difference between day and night. Venus: The nearest and brightest planet to the earth, whose rotation direction is from east to west, is called Chang Gung, Qi Ming and Taibai in ancient times. Earth: the rocky planet with the largest diameter and specific gravity, the earth-like planet with the largest mass and density, and the only celestial body in the universe where life is known to exist. Mars: Due to the axial tilt, the rotation period is similar to that of the Earth, and one revolution is about twice that of the Earth. Jupiter: the planet with the largest mass and volume and the fastest rotation. Saturn: The planet with the most beautiful rings and the most satellites (82 in total). Uranus: The inclination of rotation is the largest. Neptune: the farthest planet from the sun, with the most intense atmospheric activity and the fastest surface wind speed, is the only planet discovered by mathematical prediction rather than planned observation.