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18 Cards in this Set
- Front
- Back
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Micrometeoroid
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Tiny rock fragments no larger than sand grains that travel through space.
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Phases
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The daily changes in the moon's appearance as it is viewed from Earth.
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Lunar Eclipse
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The eclipse that occurs when the moon passes in to Earth's total shadow, or umbra, preventing sunlight from reaching the moon.
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Rilles
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A trenchlike valley running through the bedrock of lunar maria, believed to have formed ater the cave-in of the roof of a tunnel that had transported lava.
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Ray
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A bright streak of shattered rock and dust that radiates from a lunar crater.
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Maria
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Extensive dark areas on the moon that represent great basins and level plains.
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Umbra
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The darkest part of the shadow cast by the moon or by Earth.
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Penumbra
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The area of partial shadow surrounding the darkest part of the shadow of the Earth or moon.
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Waning
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The decreasing of the visible amount of the moon's illuminated surface, from full moon to the new moon.
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Gibbous
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The increasing of the visible amount of the moon's illuminated surface, from new moon to full moon.
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Mascon
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Area of higher gravity that exist over lunar maria, short for 'mass concentrations'.
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Crater
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A bowl-shaped depression on the surface of a moon or a planet.
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Regolith
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A grayish brown mixture of small rock pieces and fine particles that covers the moon.
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Astronomy
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The study of the universe.
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Meteor
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A rocky or icy fragment that travels through space.
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Solar eclipse
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The eclipse that occurs when the moon passes between the sun and Earth and the moon's shadow strikes Earth's surface.
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Gibbous
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A phase of the moon in which almost all of the bright half of the moon faces Earth.
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Meteoroid
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The rocky or icy fragment that travels through space and strikes the Earth.
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