| astronaut An astronaut goes up into space to explore. | asteroid belt The asteroid belt is a doughnut-shaped concentration of asteroids that orbit the Sun between the orbits of Mars and Jupiter. |
asteroid Asteroids are tiny planets that mostly orbit between Mars and Jupiter. |
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atmosphere The atmosphere is the gas that surrounds a planet. | astronomy Astronomy is the science that studies the universe. |
astronomer Astronomers are people who study astronomy and learn about objects in the universe, like stars and planets. |
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Big Dipper The Big Dipper is a group of 7 stars contained in the Northern Hemisphere constellation Ursa major (the Great Bear). |
aurora Auroras are beautiful lights in the near-polar sky. |
atom Everything is made up of tiny atoms. |
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constellation A constellation is a group of stars that we see in the sky. They are not necessarily located together in space, but looks as though they are from Earth. | comet A comet is the a small, icy object that orbit the Sun. It's tail always points away from the sun. | 1,000,000,000 A billion is a thousand million. The Earth is billions of years old. |
| eclipse An eclipse happens when the moon blocks out light from the sun or the Earth's shadow goes across the moon. |
Earth The Earth is the third planet from the sun. It's where we live! | crescent moon A crescent moon is smaller than a half moon. |
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galaxy A galaxy is an enormous group of stars. | full moon A full moon appears as an entire circle in the sky. |
falling star A falling star is not a star; it is a meteor (made of rock and/or iron) which is burning up in the Earth's atmosphere. |
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Jupiter Jupiter is the largest planet in our solar system and the fifth planet from the sun. |
half moon A half moon looks like half a circle. | gibbous moon A gibbous moon is between a half moon and a full moon. |
| Mercury Mercury is a moonless planet; it is the planet closest to the Sun. |
Mars Mars is a reddish planet and the fourth planet from the sun. It is the planet that comes closest to the Earth. | Little Dipper The Little Dipper is a group of stars in the constellation Ursa minor (the Little Bear). This group of stars ends at Polaris, the pole star of the Northern Hemisphere. |
| meteoroid Meteoroids are tiny stones or pieces of metal that travel through space. |
meteorite A meteorite is a meteor that has fallen to Earth. Meteorites are made of stone, iron, or stony-iron. |
meteor A meteor is a meteoroid that has entered the Earth's atmosphere, usually making a fiery trail as it falls. It is sometimes called a shooting star. Most burn up before hitting the Earth. |
| Milky Way Galaxy Our solar system is in the Milky Way galaxy. We can see the Milky Way as a band of stars in the night sky. | Milky Way The Milky Way is a bright line of stars stretching across the night sky. |
meteor shower A meteor shower is when a lot of meteor fall through the atmosphere in a short time. |
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Neptune Neptune is the eighth planet from the Sun. This frozen planet has 8 moons. |
nebula A nebula is a cloud of gas and dust in space. | moon The Earth has one moon. The moon has no atmosphere. The same side of the moon always faces the Earth. |
| orbit The Moon orbits the Earth. The Earth orbits the Sun. | observatory An observatory is place where people observe the skies, using a device like a telescope. |
North Star The north star is a star that is located almost due north and is useful for navigation. Polaris is currently the pole star of the Northern Hemisphere. |
| planetarium Planetariums put on star shows that teach astronomy. | planet Eight planets and one dwarf planet orbit our Sun. |
phases of the Moon As the moon circles the Earth, the shape of the Moon appears to change. The phases of the Moon are: the new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, last quarter, and waning crescent. |
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satellite Satellites orbit the Earth. | quasar A quasar is a distant energy source in space which gives off large amounts of radiation. |
Pluto Pluto is a dwarf planet that is uaually farther from the Sun than any of the planets (Pluto was considered to be a planet until 2006). Pluto's moon is called Charon. |
| Solar System In our Solar System, eight planets, one dwarf planet, many asteroids, comets, and other objects orbit around our sun. | shooting star A shooting star is not a star; it is a meteor (made of rock and/or iron) which is burning up in the Earth's atmosphere. | Saturn Saturn is the sixth planet from the Sun. It has beautiful rings. |
| stars Each of the stars we see in the night sky is another sun, but much farther away than our sun. |
spacesuit Astronauts wear spacesuits when they walk in space. |
space shuttle The space shuttle flies into space and back down again, carrying people and equipment. |
| Venus Venus is the second planet from the Sun and the hottest planet in our Solar System. From the Earth, Venus is the brightest object in the sky except for the Sun and the Moon. |
Uranus Uranus is the seventh planet from the Sun. Uranus looks bluish and is covered with clouds. It has an unusual, tipped axis, which gives it extreme seasons. |
Sun The Sun is a medium-sized yellow star in our Solar System. We get our light and most of our energy from the Sun. |
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zodiac The zodiac is a band of 12 constellations (groups of stars) in the sky, including Capricorn, Aquarius, Sagittarius, Scorpio, Libra, Virgo, Leo, Cancer, Gemini, Taurus, Aries, and Pisces. |
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