vocabulary for astronomy
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| astronomy | The study of the moon, stars, and other objects in space.
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| axis | An imaginary line that passes through Earth's center and the North an South poles, about which Earth rotates.
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| rotation | The spinning motion of a planet about its axis.
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| revolution | The movement of an object around another object.
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| orbit | The path one object takes around another.
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| tilt | When something is almost straight or flat.
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| solstice | Time of the year when the day is either shortest, or longest depending on where you are.
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| equinox | Twice a year, when the day and night are the same amount of time all around the world.
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| phase | The apparent change in the shape of the Moon, Mercury, and Venus due to how much of the sunlit side is facing the Earth.
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| eclipse | When our view of one object in the sky is blocked by either another object, or the Earths shadow.
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| gravity | The force that holds planets in their orbits around the Sun.
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| tide | The rise and fall of the level of water in the ocean.
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| satellite | A small object orbiting a larger one. There are many electronic objects that orbit the Earth.
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| telescope | A device built to study distant objects by making them appear closer.
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| geocentric | A description of the solar system in which all planets revolve around Earth.
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| heliocentric | A description of the solar system in which all of the planets revolve around the sun.
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| inner planet | Mercury and Venus which lie closer to the Sun than the Earth are called inferior planets.
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| outer planet | The planets which lie further from the Sun than the Earth.
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| comet | A small, frozen mass of dust and gas revolving around the sun.
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| asteroid | A rock, or Minor Planet orbiting the Sun.
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| meteroid | Any small object in Outer Space, such as dust, or a rock.
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| constellation | A grouping of stars which have been given names by ancient astronomers because of the way they look.
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| galaxy | A group of stars, gas and dust held together by gravity.
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| universe | All of space and everthing in it.
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| Milky Way | Our Galaxy. (the word "Galaxy" actually means milky way in Greek).
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