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25 Cards in this Set

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