12 Pearson

astronomy

The study of the moon, stars, and other objects in space

axis

the imaginary line that passes through Earth's center and the North and South poles is Earth's __

rotation

The spinning of Earth on its axis is

revolution

the movement of one object around another.

orbit

Earth follows a path, or __, as it revolves around the sun.

calendar

A ___ is a system of organizing time that defines the beginning, length, and divisions of a year.

solstice

when the sun is farthest north or south of the equator, is known as __

equinox

halfway between the solstices, neither hemisphere is tilted toward or away from the sun. This occurs twice a year, when the noon sun is directly overhead at the equator.

force

a push or a pull.

gravity

attracts all objects toward each other

Universal Law of Gravitation

states that every object in

universe attracts every other object.

mass

the

amount of matter in an object.

inertia

The tendency of an object to resist a change in motion

Newtons first law of motion

says 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 an unbalanced force.

weight

force of gravity on an object