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Children's Dictionary
color a quality of light as our eyes see it. Light is made up of waves, which hit objects and are reflected from their surfaces. The colors we see, such as red, blue, and yellow, depend on how these light waves are reflected. Objects of different colors reflect different kinds of light waves. [1/5 definitions]
earth (often capitalized) the fifth largest planet in our solar system and the third in distance from the sun. [1/4 definitions]
galaxy a collection of billions of stars and other matter held together by gravity. Our planet Earth and the sun belong to the Milky Way galaxy. They are only tiny parts of this galaxy.
mantle the layer of the earth that lies between the crust and the core. The crust is the top layer of the earth--the layer we live on. The core is the center of our earth. The mantle is very thick and makes up most of the entire planet. [1/2 definitions]
meteor a bright streak or flash in the sky which occurs when small pieces of space material enter our atmosphere and burn up, often called a shooting star.
ourselves our own selves (used to show that an action is done to the same people who are doing the action). [2/3 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.
solar system our Sun, its eight planets and their moons, and all other bodies that travel around the Sun, or any system that includes a star and all of the matter which orbits that star, including planets and moons.
SOS a call for help from a ship that is in trouble. SOS is an abbreviation for save our ship.
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]