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