Flash Cards

chapter 15 vocabulary science

Question Answer
Astronomy The study of moon, stars, and other objects in space.
Axis The imaginary line that passes through Earth's center and North and South poles.
Rotation The 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 object in space.
Solstice The two days of the year on which the sun reaches its greatest distance north or south of the equator.
Equinox The two days of the year on which neither hemisphere is tilted toward or away from the sun.
Force A push or a pull exerted on an object.
Gravity A force that moves rocks and other materials downhill; the force that pulls objects toward each other.
Law of Universal Gravitation The scientific law that states that every object in the universe attracts every other object.
Mass The amount of matter in an object.
Weight The force of gravity on an object.
Inertia The tendency of an object to resist a change in motion.
Newton's 1st law of motion The scientific law that states that 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 One of different apparent shapes of the moon as seen from Earth.
Eclipse The partial or total blocking of one object in space by another.
Solar Eclipse The blocking of sunlight to Earth that occurs when the moon is directly between the sun and 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 a shadow surrounding the darkest part.
Telescope A device built to observe distant objects by making them appear closer.
Maria Dark, flat area's on the moon's surface formed from huge ancient lava flows.
Crater A bowl-shaped area that forms around a volcano's central opening.
Meteoroid A chunk of rock or dust in space.


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