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Answer:
Here are the definitions of the solar system and its major planets:
Solar System:
- The solar system consists of the sun and everything that orbits around it, including our planet Earth.
Sun:
- The star at the center of our solar system. It contains 99.8% of the mass of the entire system.
Mercury:
- Closest planet to the sun. No atmosphere or moons. Very hot days but cold nights.
Venus:
- Second planet from the sun. Has a very dense, toxic atmosphere made of carbon dioxide. Surface is hot enough to melt lead.
Earth:
- Third planet from the sun. Only planet known to support life. Has one moon. Atmosphere contains nitrogen and oxygen.
Mars:
- Fourth planet from the sun. Known as the "Red Planet" due to its iron-rich surface. Has seasonal polar ice caps and dust storms.
Jupiter:
- Largest planet in the solar system. Made primarily of gas like hydrogen and helium. Famous red spot is a giant storm. Has 69 moons.
Saturn:
- Known for its prominent and beautiful rings made of ice particles and dust. Made of hydrogen and helium gas. Has 82 confirmed moons.
Uranus:
- Seventh planet from the sun. Similar chemical composition to Neptune. Tips over on its side as it rotates. Has 27 known moons.
Neptune:
- Eighth and farthest planet from the sun. Similar in composition to Uranus but more massive. Winds can reach 1500 miles per hour. Has 14 known moons.
Answer:
According to NASA,
Our solar system is made up of a star—the Sun—eight planets, 146 moons, a bunch of comets, asteroids and space rocks, ice, and several dwarf planets, such as Pluto. The eight planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Mercury is closest to the Sun. Neptune is the farthest.
Planets, asteroids, and comets orbit our Sun. They travel around our Sun in a flattened circle called an ellipse. It takes the Earth one year to go around the Sun. Mercury goes around the Sun in only 88 days. It takes Pluto, the most famous dwarf planet, 248 years to make one trip around the Sun.
Moons orbit planets. Right now, Jupiter has the most named moons—50. Mercury and Venus don't have any moons. Earth has one. It is the brightest object in our night sky. The Sun, of course, is the brightest object in our daytime sky. It lights up the moon, planets, comets, and asteroids.