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25 Cards in this Set
- Front
- Back
MOON
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* natural satellite of Earth
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TERRAE
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* light areas seen on moon
* rugged, cratered highlands |
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MARIA
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* dark areas seen on moon
* smooth plains, fewer craters than terrae * ancient lava flows * word means "seas" |
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BIG WHACK
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* theory of moon origin
* large object collided w/early Earth * large parts of Earth broke away - came together to form moon |
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PHASE
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* changing shape of the bright part of the moon
* 8 lunar phases |
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NEW MOON
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* non-illuminated side of moon is facing Earth
*rises with sun in am *during this phase a solar eclipse can occur |
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ILLUMINATE
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* to make something visible or bright w/light
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FIRST QUARTER MOON
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* right half of moon's visible surface is illuminated
* waxing |
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FULL MOON
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* illuminated side of moon facing Earth
* Full disk of moon seen * rises as sun sets * during this phase a lunar eclipse can occur |
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WAXES
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* appears to grow larger from left to right
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WANES
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* appears to grow smaller from right to left
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CRESCENT
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* partly, but less than half of moon is illuminated
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GIBBOUS
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* more than half of moon is illuminated
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3rd QUARTER MOON
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*AKA - LAST QUARTER
* left half of moon's visible surface illuminated * waning |
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SIDEREAL REVOLUTION
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* time to complete one full revolution around Earth
* 27.3 days |
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SYNODIC REVOLUTION
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* time to complete cycle of moon phases
* 29.5 days * due to Earth revolving around sun while moon revolves around Earth |
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FAR SIDE
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* AKA - by misnomer as DARK SIDE
* side of moon we never see |
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NEAR SIDE
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* side of moon always facing Earth
* only side we ever see |
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ECLIPSE
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* when one astronomical body casts a shadow onto another body in space (can be total or partial)
* named for the object that is obscured * 2 types: lunar and solar |
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NODE
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* where the orbit of one body intersects the orbit of another
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SOLAR ECLIPSE
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* occurs when the moon blocks the sun’s light
* happens only during New Moon |
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LUNAR ECLIPSE
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* occurs when the Earth blocks the sun’s light so that it doesn’t hit the moon
* happens only during full Moon |
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UMBRA
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* dark, cone-shaped inner shadow of an eclipse
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PENUMBRA
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* larger, lighter, outer shadow caused by an eclipse
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PATH OF TOTALITY
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* circular shadow of umbra that reaches Earth’s surface
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