Space science Meadow

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1.PlanetA planet is a celestial body that orbits the Sun, has sufficient mass for its own gravity to shape it into a nearly round sphere, and has cleared the neighborhood around its orbit of other signigicant objects.
2. MoonThe natural satellite of the earth, visible by reflected light from the sun.
3. Universeall existing matter and space considered as a whole; the cosmos. The universe is believed to be at least 10 billion light years in diameter and contains a vast number of galaxies; it has been expanding sincenits creation in the Big Band about 13 billion years ago.
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4. GalaxyA galaxy is a massive, gravitationally bound system consisting of stars, stellar remnants, interstellar gas, dust, and dark matter.Ranging from dwarfs with thousands to giants with trillions of stars, they orbit a central mass. They are classified mainly as spiral, elliptical, or irregular.
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4. AsteroidAsteroid is a small rocky body orbiting the sun. Large numbers of these, ranging in size from nearly 600 miles ( 1,000 km) across ( Ceres) to dust particles, are found ( as the asteriod belt) especially between the orbits of Mars and Jupiter, though some have more eccentric orbits, and a few pass close to the earth or enter the atmosphere as meteors.
5. OrbitThe curved path of a celestial object or spacecraft round a star, planet, or moon, especially a periodic elliptical revolution.

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