Earth Science Astronomy Chapter 1 Earth, Moon,& Sun

25 terms by jvaught

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astronomy

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

axis

the center around which something rotates

rotation

the spinning of the 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

calendar

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

equinox

period of equal days and nights; the beginning of spring and autumn; Ex. vernal/autumnal equinox

force

a push or pull

gravity

the force that attracts all objects toward each other

law of universal gravitation

every object ibn 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

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

phases

the different shapes of the moon you see from Earth

eclipse

When an objet in space moves between the sun and a third object, it casts a shadow on the third object.

umbra

darkest part of the moon's shadow

penumbra

partial shadow (in an eclipse)

tide

the rise and fall of the ocean water that occurs every 12.5 hours or so.

spring tide

a tide with the greatest difference between low and high tides

neap tide

the tide with the least difference between consecutive low and high tides

craters

large round pits in the moon's surface

meterods

chunks of rock or dust from space

maria

dark, flat regions on the moon's surface also > the Latin word for "seas"

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