The Solar System is made of our Sun and the planets that move around it. In addition to planets, the Solar System also includes moons, comets, asteroids, dust, and gas. Everything in the Solar System orbits, or moves around, the Sun. A planet is a huge object that moves around the Sun. There are eight planets in the Solar System. They are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. A comet is an object in outer space that develops a long, bright tail when it passes near the Sun. It is made up of dust and ice, somewhat like a dirty snowball. A planet is a huge object that moves around the Sun.
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.