Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off
Reading...
Front

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key

image

Play button

image

Play button

image

Progress

1/33

Click to flip

33 Cards in this Set

  • Front
  • Back
What is the minimum speed an object must have to free itself from gravitational pull?
escape velocity
What is the push or pull on an object?
force
What is the amount of matter in an object?
mass
What is the line dividing the lighted side of the moon from the dark side?
terminator
What are the bright streaks on the surface of the moon?
rays
What is a shape formed by a dark area on the moon called?
mare
What is a long, narrow valley on the moon's surface?
rill
What is the point of the moon's closest approach to the earth?
perigee
What is the most distant point of the moon's orbit?
apogee
What is the phase of the moon when it is positioned in its orbit between the sun and the earth and is not visible because of the sun's glare?
new moon
What is the increasing phase of the moon, during the week following the new moon, when its illuminated portion appears as a thin, gradually thickening crescent?
waxing crescent
What are the horns of a crescent moon that always point away from the sun?
cusp (lunar)
What is the sunlight that is reflected from the earth to the moon and back again?
earthshine
What is the phase of the moon when the western half of the moon is lighted and the eastern half is dark?
first quarter
What is the increasing phase of the moon, during the second week following the first quarter, when the illuminated portion is gradually enlarging toward a full moon?
waxing gibbous
What is the lunar phase in which the moon's entire near side is lighted?
full moon
What is the name of the full moon nearest the autumnal equinox (September 22)?
harvest moon
What is the next full moon after the harvest moon?
hunter's moon
What is the decreasing phase of the moon, following a full moon, when the illuminated disk gradually diminishes to the third quarter?
waning gibbous
What is the phase of the moon in which the eastern half is lighted and the western half is dark? It is also called the last quarter.
third quarter
What is another name for the third quarter of the moon?
last quarter
What is the decreasing phase of the moon during the last week of the lunar cycle?
waning crescent
What results when the moon comes between the earth and the sun?
solar eclipse
What happens when the moon covers the sun's entire disk during a solar eclipse?
total eclipse
What type of eclipse happens when the moon covers only part of the sun's disk and the observer is in the prenumbra of the moon's shadow?
partial eclipse
What kind of eclipse happens when the moon is near its apogee and a ring-shaped portion of the sun's disk shows around the moon?
annular eclipse
During a total eclipse, what are the bright pinpoints of light caused by sunlight shining through valleys at the moon's edge?
Baily's beads
During a total eclipse, what is it called when there is a last bright sparkling bead along the remaining thin solar crescent?
diamond ring effect
What is it called when the moon passes into the earth's shadow?
lunar eclipse
What is the name of the theory that suggests that at one time the moon was an independent planet orbiting the sun?
capture theory
What is the naturalistic theory of the origin of the moon suggesting that somehow the moon split away from the earth when the earth was still molten?
fission theory
What theory suggests that the moon accumulated from a cloud of dust or gas?
accretion theory
What is a naturalistic theory for the origin of the moon that suggests that matter in the moon was once a part of the earth, but a collision with another celestial object ejected the matter from the earth and some of the matter coalesced and went into orbit around the earth as the moon?
impact theory