science chapter 1

science chapter 1

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Term Definition
astronomy the study of the moon, stars, and other objects in space
rotation the spinning of earth on its axis
orbit the path of an object as it revolves around another object in space
soltice the two days of the year on which the sun reaches its greatest distance north or south of the equator
axis imaginary line that passes through Earth's center and the North and South poles
revolution the movement of one object around another
calendar a system of organizing time that defines the beginning, length, and divisions of a year
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 a object
gravity attracts all objects toward each other
law of universal gravitation 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 first 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
phases different shapes of the moon that you see fom Earth
solar eclipse When the moon passes between the earth and the sun
penumbra The part of a shadow surrounding the darkest part.
tide The rise and fall of ocean water.
neap tide The tide with the least difference between consecutive low and high tides
eclipse When moons shadow hits earth or earths shadow hits the moon.
umbra The darkest part of the shadow
lunar eclipse When the earth is directly between the sun and moon.
spring tide The tide with the greatest difference of low and high tides
telescope A devise built to observe distant objects by making them apear closer
maria Dark, flat areas of the moons surface foarmed from huge lava flows .
craters A large round pit on the moons surface formed by the impact of a meteroid.
meteoroids A chunk of rock or dust in space.

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