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GPS: This stands for Global Positioning System. It’s a system that uses satellites, ground stations, and receivers to tell you exactly where you are on Earth.

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GPS: This stands for Global Positioning System. It’s a system that uses satellites, ground stations, and receivers to tell you exactly where you are on Earth.

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Gas: A loose collection of atoms moving around each other.

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Gas: A loose collection of atoms moving around each other.

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Gamma rays: Part of the electromagnetic spectrum, also called gamma radiation. These waves have lots of energy. They come from big events like solar flares and exploding stars.

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Gamma rays: Part of the electromagnetic spectrum, also called gamma radiation. These waves have lots of energy. They come from big events like solar flares and exploding stars.

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Galaxy: A collection of thousands to billions of stars held together by gravity. The galaxy we live in is called the Milky Way.

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Galaxy: A collection of thousands to billions of stars held together by gravity. The galaxy we live in is called the Milky Way.

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Exoplanet: A planet that freely floats between stars or one that orbits a star outside our solar system.

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Exoplanet: A planet that freely floats between stars or one that orbits a star outside our solar system.

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Equator: The circle around a planet or moon that is the same distance from its north pole and its south pole.

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Equator: The circle around a planet or moon that is the same distance from its north pole and its south pole.

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Electromagnetic Spectrum: The name for all the different kinds of light and energy in the universe. This includes radio waves, microwaves, infrared radiation, visible light, ultraviolet light, X-rays, and gamma rays. 

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Electromagnetic Spectrum: The name for all the different kinds of light and energy in the universe. This includes radio waves, microwaves, infrared radiation, visible light, ultraviolet light, X-rays, and gamma rays. 

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El Niño: A weather condition that sometimes occurs in the Pacific Ocean. It is so big that it affects weather all over the world. It starts with unusually warm water in the Pacific Ocean near the equator.

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El Niño: A weather condition that sometimes occurs in the Pacific Ocean. It is so big that it affects weather all over the world. It starts with unusually warm water in the Pacific Ocean near the equator.

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Dwarf planet: Objects that are round and orbit the sun, just like planets do. But unlike planets, dwarf planets are not able to clear their path around the sun. That means there are other objects orbiting at roughly the same distance from the sun. A dwarf planet is much smaller than a planet (smaller even than Earth's moon), but it is not a moon. Pluto is the best known of the dwarf planets.

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Dwarf planet: Objects that are round and orbit the sun, just like planets do. But unlike planets, dwarf planets are not able to clear their path around the sun. That means there are other objects orbiting at roughly the same distance from the sun. A dwarf planet is much smaller than a planet (smaller even than Earth's moon), but it is not a moon. Pluto is the best known of the dwarf planets.

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Crater: A large, bowl-shaped dent in the ground. They can be caused by an explosion or the impact of a meteorite. 

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Crater: A large, bowl-shaped dent in the ground. They can be caused by an explosion or the impact of a meteorite. 

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Cosmos: The universe seen as an orderly, harmonious whole. 

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Cosmos: The universe seen as an orderly, harmonious whole. 

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Corona: The outer atmosphere of a star. 

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Corona: The outer atmosphere of a star. 

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Constellation: A group of stars in the sky. They're often named after an animal, object, or person. The stars form certain patterns based on where you are. We have one view of stars here on Earth, but from another solar system or galaxy, the constellations would look different. 

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Constellation: A group of stars in the sky. They're often named after an animal, object, or person. The stars form certain patterns based on where you are. We have one view of stars here on Earth, but from another solar system or galaxy, the constellations would look different. 

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Comet: An icy rock that lets off gas and dust, which may form tails when it is flying close to a sun. 

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Comet: An icy rock that lets off gas and dust, which may form tails when it is flying close to a sun. 

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Black hole: A place in space where matter and light cannot escape if they fall in.

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Black hole: A place in space where matter and light cannot escape if they fall in.

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Aurora borealis: Bright glows and bands of light that appear in the skies at night near the North Pole. They are also called the northern lights.

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Aurora borealis: Bright glows and bands of light that appear in the skies at night near the North Pole. They are also called the northern lights.

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Aurora australis: Bright glows and bands of light that appear in the skies at night near the South Pole. They are also called the southern lights.

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Aurora australis: Bright glows and bands of light that appear in the skies at night near the South Pole. They are also called the southern lights.

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Atom: The basic building block of matter. It is made of protons, neutrons, and electrons. There are many different kinds of atoms. For example, the simplest atom with one proton and one electron is a hydrogen atom. An atom with six protons, six neutrons, and six electrons is a carbon atom.

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Atom: The basic building block of matter. It is made of protons, neutrons, and electrons. There are many different kinds of atoms. For example, the simplest atom with one proton and one electron is a hydrogen atom. An atom with six protons, six neutrons, and six electrons is a carbon atom.

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Atmosphere: The gases held by gravity around Earth and around other planets. "Atmosphere" can also be used to talk about gases around stars. 

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Atmosphere: The gases held by gravity around Earth and around other planets. "Atmosphere" can also be used to talk about gases around stars. 

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Asteroid: Rocks floating around in space. Some are the size of a pick-up truck. Others are hundreds of miles across. 

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Asteroid: Rocks floating around in space. Some are the size of a pick-up truck. Others are hundreds of miles across. 