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Ch.15 vocab
Question | Answers |
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Astronomy | The study of the moon, stars, and other objects in space |
Axis | An imaginary line that passes through Earths center and north and south poles about which Earth rotates |
Rotation | Spinning of Earth on its axis |
Revolution | The movement of one object around another |
Orbit | The path of an object as it revolves around another in space |
Solstice | When the sun is farthest north or south of the equator |
Equinox | when the noon sun is directly overhead at the equator |
Force | push or pull |
Gravity | a force that pulls all objects toward each other |
Law of Universal Gravitation | every object in the universe attracts every other object |
Mass | amount of matter in an object |
Weight | force of gravity on an object |
Inertia | the tendancy of an object to resist a change in motion |
Newton's 1st law of motion | an object at rest will stay at rest and an object in motion will stay in motion with a constant speed and direction unless acted on by a force |
Phase | The different shapes of the moon we see from earth |
Eclipse | when in object in space comes between the sun and a third object, it casts a shadow on an object |
Solar Eclipse | when the moon passes directly between earth and sun blocking sunlight from earth |
Lunar Eclipse | the blocking of sunlight to the moon that occurs when Earth is directly between the sun and the moon |
Umbra | the darkest part of a shadow |
Penumbra | the part of the shadow surrounding the dakest part |
Telescope | a device built to observe distant objects by making them appear closer |
Maria | dark, flat areas on the moons surface formed from huge ancient lava flows |
Crater | a large pit formed by impact of meteoroids |
Meteoroids | a chunk of rock or dust in space |