19 terms

Phases of the Moon and Eclipses

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Terms in this set (...)

moon phases
the different shapes of the moon that we see in the night's sky
lunar cycle
the time it takes for the moon to make one full revolution around the Earth- 29.5 days
waxing phase
when the lit portion of the moon we see gets larger
waning phase
when the lit portion of the moon se see gets smaller
new moon
happens when the moon is located between Earth and the sun- we can not seen the moon at this time- this moon begins the lunar cycle
waxing crescent
phase that occurs after the new moon phase, this crescent shape that appears to get bigger from day to day
first-quarter moon
occurs after the waxing crescent phase, when half the bright side of the moon is visible from Earth
waxing gibbous
occurs after the first-quarter phase, when more MORE than half of the moon's lit side faces Earth
full moon
occurs when the moon has moved halfway around it orbit and the entire lit side of the moon faces Earth
waning gibbous
occurs after the full moon phase, when you see less of the lit half of the moon as time passes
third-quarter moon
occurs after the waning gibbous phase, when half the lit side of the moon is facing away- moon has completed 3/4 of a revolution around Earth
waning crescent
occurs after the third-quarter phase of the moon, when you see even less of the lit side of the moon
eclipse
occurs when one object in space casts a shadow on another object in space
solar eclipse
occurs when the moon comes between the Earth and the Sun- the moon blocks the sun's light from reaching parts of the Earth- Moon casts a shadow on the Earth- can only happen during a new moon phase
lunar eclipse
occurs when the Earth comes between the sun and the moon, and the Earth casts a shadow on the moon - can only occur when the moon, Earth, and Sun are lined up in a row. - Can only happen during a full moon phase
gravity
a force that pulls all objects toward each other. It is the force that controls the motion of all objects in the solar system, from the smallest asteroid to the largest planet.
law of universal gravitation
states that every object in the universe attracts every other object. The force of attraction between two objects depends on the mass of the objects and their distance apart.
umbra
the darkest part of a shadow during an eclipse
Penumbra
the lighter part of a shadow where light is partially blocked during an eclipse

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