Mercury, Mercury: The smallest planet and the closest to the Sun., Venus, Venus: The second planet from the Sun, similar in size to Earth, and the hottest planet in our solar system., Earth, Earth: The third planet from the Sun and the only known planet to support life., Mars, Mars: The fourth planet from the Sun, known as the "Red Planet" because of its rusty, iron-rich soil., Jupiter, Jupiter: The fifth planet from the Sun and the largest planet in our solar system., Saturn, Saturn: The sixth planet from the Sun, famous for its large and beautiful system of rings made of ice and rock., Uranus, Uranus: The seventh planet from the Sun, a gas giant that rotates on its side., Neptune, Neptune: The eighth planet from the Sun, a cold, dark, and windy ice giant., Sun, Sun: The star at the center of our solar system, which provides heat and light to the planets., Moon, Moon: A natural satellite that orbits a planet; for example, Earth's moon., Star, Star: A giant ball of hot, burning gas (plasma) that produces its own light and heat., Asteroid, Asteroid: A small, rocky object that orbits the Sun, mostly found in the "asteroid belt" between Mars and Jupiter., Comet, Comet: An icy object that orbits the Sun and develops a bright "tail" of gas and dust as it gets closer to the Sun., Meteor, Meteor: A small piece of rock or metal that burns up when it enters Earth's atmosphere, also called a "shooting star.", Meteorite, Meteorite: A meteor that does not burn up completely in the atmosphere and lands on Earth's surface., Galaxy, Galaxy: A huge system of millions or billions of stars, together with gas and dust, held together by gravity (e.g., the Milky Way)., Black Hole, Black Hole: A region in space where gravity is so strong that nothing, not even light, can escape from it., Constellation, Constellation: A group of stars that forms a recognizable pattern or shape in the night sky, often named after animals, objects, or mythological characters., Telescope, Telescope: An instrument that uses lenses or mirrors to make distant objects appear larger and closer, used to observe planets and stars., Astronaut, Astronaut: A person who is trained to travel, work, and live in a spacecraft or on a space mission., Spacecraft, Spacecraft: A vehicle or machine designed to travel and operate in outer space., Satellite, Satellite: An object placed in orbit around a planet or star to collect information, for communication, or for navigation (like GPS)., Rocket, Rocket: A powerful vehicle that burns fuel to create thrust and launch objects, people, or spacecraft into space., Observatory, Observatory: A building or facility equipped with telescopes and other scientific instruments for observing astronomical events., Orbit, Orbit: The curved, repeating path followed by an object, such as a planet or moon, as it travels around a larger object in space., Atmosphere, Atmosphere: The layer of gases surrounding a planet, moon, or star that is held in place by gravity., Gravity, Gravity: The natural force that attracts any two objects with mass, pulling them together. It keeps planets in orbit around the Sun and objects on the ground., Light Year, Light Year: The distance that light travels in one year (about 9.5 trillion kilometers), used to measure enormous distances between stars and galaxies., Solar System, Solar System: The collection of planets, moons, asteroids, comets, and other objects that orbit around a star (specifically, our Sun)., Universe, Universe: All of space and everything that exists within it, including all matter, energy, planets, stars, galaxies, and the contents of intergalactic space..

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