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20 Cards in this Set
- Front
- Back
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sphere
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A round 3D object such as a planet like earth.
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axis
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An imaginary line about which a body rotates.
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rotation
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A circular motion of an object around center or point of turning.
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revolution
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A motion in orbit or circular course or around another object.
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ellipse
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Earth's year long orbit around the sun.
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solstice
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Twice yearly point when the sun is the greatest distance from the Northern or Southern equator.
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equinox
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Twice a year when day and night are of equal lengths. March 21 and September 22.
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moon phase
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Change in periods of the moon as viewed from Earth.
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new moon
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The phase of the moon when it is in conjunction with the sun and invisible from earth, or shortly thereafter when it appears as a slender cresent.
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waxing moon
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The moon at any time after new moon and before full moon
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full moon
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The phase of the moon in which its whole disk is illuminated.
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waning moon
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The moon at any time after full moon and before new moon
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solar eclipse
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an eclipse in which the sun is obscured by the moon.
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lunar eclipse
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An eclipse in which the moon appears darkened as it passes into earth's shadow.
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maria
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a large, level vasalt plain on the surface of the moon, appearing dark by contrast with highland areas.
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rocket
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A cylindrical projectile that can be propelled to a great height or distance by the combustion of its contents, used typically as a firework or signal.
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electromagnetic spectrum
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The range of wavelengths or frequencies over which electromagnetic radiation extends.
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refracting telescope
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A telescope that uses a converging lens to collect light.
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reflecting telescope
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A telescope in which a mirror is used to collect and focus light.
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observatory
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a room or building housing an astronomical telescope or other scientific equipment for the study of natural phenomena.
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