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Prentice Hall Astron
Chapter 1
Question | Answer |
---|---|
imaginary line that passes through Earth's center and North & South poles | axis |
spinning of Earth on its axis | rotation |
movement of one object around another | revolution |
path | orbit |
sun is farthest north or south of the equator | solstice |
system of organizing time | calendar |
when noon sun is directly overhead at the equator | equinox |
push or pull | force |
a force that pulls moon toward Earth | gravity |
every object in the universe attracts every other object | law of universal gravitation |
amount of matter in an object | mass |
force of gravity on an object | weight |
tendancy of an object to resist a change in motion | inertia |
an object at rest will stay at rest . . . | Newton's first law of motion |
different shapes of the moon you see from Earth | phases |
when an object in space comes between the sun and a third object | eclipse |
darkest part of the moon's shadow | umbra |
larger part of the shadow | penumbra |
full moon when Earth is directly between the moon and the sun | lunar eclipse |
the rise and fall of ocean water | tides |
greatest difference between consecutive low and high tides | spring tide |
least difference between consecutive low and high tides | neap tide |
device built toobserve distant objects by making them appear closer | telescope |
maria | dark, flat areas on moon's surface |
crater | large round pits |
chunks of rock or dust from space | meteoroids |