Question | Answer |
the study of the moon, stars, and other objects in space | astronomy |
an imaginary line that passes through Earth's center and the North and South poles, about which Earth rotates | axis |
the spinning motion of a planet on its axis | rotation |
the movement of an object around another object | revolution |
the path of an object as it revolves around another object in space | orbit |
a system of organizing time that defines the beginning, length, and divisions of a year | calendar |
the two days of the year on which the sun reaches its greatest distance north or south of the equator | solstice |
the two days of the year on which neither hemisphere is tilted toward or away from the sun | equinox |
a push or pull exerted on an object | force |
the attractive force between objects; its strength depends on theie masses and the distance between them | gravity |
the scientific law that states that every object in the universe attracts every other object | law of universal gravitation |
the amount of matter in an object | mass |
the force of gravity on a object | weight |
the tendency of an object to resist a change in motion | inertia |
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 | Newton's first law of motion |