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Our solar system consists of eight planets orbiting around the Sun. From closest to farthest from the Sun, they are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
Galaxies are massive collections of stars, gas, and dust held together by gravity. Our galaxy, the Milky Way, contains hundreds of billions of stars and is just one of billions of galaxies in the observable universe.
Black holes are regions of spacetime where gravity is so strong that nothing, not even light, can escape from them. They are formed when massive stars die and collapse under their own gravity.