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Chapter 27

Vocabulary

TermDefinition
Electromagnetic spectrum all types of electromagnetic radiation arranged according to wavelength and frequency.
Refracting telescope telescope that uses lenses to focus visible light.
Reflecting telescope telescope that uses mirrors to focus visible light
interferometry process that links separate telescopes so they act as one telescope, producing more detailed images as the distance between them increases.
albedo percentage of sunlight that is reflected by the surface of a planet or a satellite, such as the Moon.
highland light colored, mountainous, heavily cratered area of the Moon, composed mostly of lunar breccias.
maria dark-colored, smooth plains on the Moon surface.
impact crater crater formed when space material impacted on Moon's surface.
ejecta material that falls back to the lunar surface after being blasted out by the impact of the space object.
ray long trail of ejecta that radiates outward from a Moon crater.
rille valley like structure that meanders across some regions of the Moon's maria.
regolith layer of loose ground-up rock on the lunar surface.
ecliptic plane plane of earth's orbit around the sun.
solstice period when the sun is overhead at its farthest distance either north or south of the equator.
equinox time of year during which earth's axis is at a 90 degree angle to the sun; both hemispheres receive exactly 12 hours of sunlight and the sun is directly overhead.
synchronous rotation the state at which the moon's orbital and rotational periods are equal.
solar eclipse when the moon passes between earth and the sun and the moon casts a shadow on earth, blocking earths view of the sun; can be partial or total.
perigee closest point on the moon's elliptical orbit to earth.
apogee farthest point in the moons elliptical orbit to earth.
lunar eclipse when earth passes between the sun and the moon, earth's shadow falls on the moo; occurs only during a full moon.
Created by: kindredmcdaniel
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