Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
28 Cards in this Set
- Front
- Back
|
astronomy
|
the study of moon stars and other objects in space
|
|
|
axis
|
an imaginary line that passes through Earth's center and the N and S poles, about which the earth rotates
|
|
|
rotation
|
the spinning motion of a planet on its axis
|
|
|
revolution
|
the movement of an object around another object
|
|
|
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
|
the two days of the year on which the sun reaches it 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 pull exerted on an object
|
|
|
gravity
|
the attractive force between objects
|
|
|
law of universal gravitational
|
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 first law of motion
|
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 the different apparent shapes of the moon
|
|
|
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
|
|
|
umbra
|
the darkest part of a shadow
|
|
|
penumbra
|
the part of a shadow surrounding the darkest part
|
|
|
lunar eclipse
|
the blocking of sunlight to the moon that occurs when Earth is directly between the sun and the moon
|
|
|
tide
|
the periodic rise and fall of the level of water in the ocean
|
|
|
spring tide
|
the tide with the greatest difference between consecutive low and high tides
|
|
|
neap tide
|
the tide with the least difference between consecutive low and high tides
|
|
|
telescope
|
a device built to observe distant objects by making them appear closer
|
|
|
maria
|
dark, flat areas on the moon's surface formed from huge ancient lava flows
|
|
|
craters
|
a large round pit caused by the impact of a meteoroid
|
|
|
meteoroid
|
a chunk of rock or dust in space
|
