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vocab ch. 19

quiz 3/25/11

QuestionAnswer
astronomy The study of the moon, stars, and other objects in space
axis An imaginary line that passes through Earth's center and the North and South poles, about which Earth rotates
rotation The spinning motion of a planet about its axis.
orbit The path of an object as it revolves around another object in space
latitude The distance north or south from the equator, measured in degrees
solstice The two days of the year on which the noon sun is directly overhead at either 23.5° South or 23.5° North
equinox The two days of the year on which neither hemisphere is tilted toward or away from the sun
vernal equinox The day of the year that marks the beginning of spring in the Northern Hemisphere
autumnal equinox The day of the year that marks the beginning of fall in the Northern Hemisphere
phase One of the different shapes of the moon as seen from Earth
eclipse The partial or total blocking of one object by another
solar eclipse The blocking of sunlight to Earth that occurs when the moon is between the sun and Earth
umbra The darkest part of a shadow
penumbra The part of a shadow surrounding the darkest part
lunar eclipse The blocking of sunlight to the moon that occurs when Earth is directly between the sun and moon
tides The daily rise and fall of Earth's waters on shores
gravity The attractive force between two objects; its magnitude depends on their masses and the distance between them.
satellite Any object that revolves around another object in space
geosynchronous orbit The orbit of a satellite that revolves around Earth at the same rate that Earth rotates
telescope A device built to study distant objects by making them appear closer
crater A bowl-shaped area that forms around a volcano's central opening; A round pit on the moon's surface
maria Dark, flat regions on the moon's surface
Created by: lcollins1
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