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earth (often capitalized) the fifth largest planet in our solar system and the third in distance from the sun. [1/4 definitions]
Jupiter the largest planet in the solar system and fifth in distance from the sun. Jupiter has sixteen moons and is more than one thousand times larger than Earth. [1/2 definitions]
Mars the seventh largest planet in the solar system and fourth in distance from the sun. Mars is known as "the red planet" because of its unusual color. [1/2 definitions]
mercury (capitalized) the planet of the solar system that is nearest to the sun. Mercury is the second smallest planet. [1/3 definitions]
Milky Way the galaxy that contains the earth, the sun, and the solar system. It can be seen in the night sky as a long, cloudy group of stars.
Neptune the fourth largest planet in the solar system and eighth in distance from the sun. [1/2 definitions]
planet a large body in outer space that circles around the sun or another star. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto are all planets in our solar system.
Pluto a dwarf planet in the Earth's solar system, formerly considered a planet and the one that was smallest and farthest from the sun. [1/2 definitions]
Saturn the second largest planet in the solar system and sixth in distance from the sun. Saturn is known for the icy rings that circle its middle. [1/2 definitions]
sun the star in the middle of our solar system. The earth and other planets revolve around it and receive heat and light from it. [1/5 definitions]
Uranus the third largest planet in the solar system and seventh in distance from the sun. [1/2 definitions]
Venus the sixth largest planet in the solar system and second in distance from the sun. Venus has a dense, cloudy atmosphere. The clouds that cover Venus reflect light and make it the brightest planet. [1/2 definitions]