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Chapter 27

Across
Material that falls back to the lunar surface after being blasted out by the impact of a space object
Telescope that uses lenses to focus visible light
Valleylike structure that meanders across some regions of the Moon's maria
Crater formed when space material impacted on Moon's surface
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 at the equator
Process that links separate telescopes so they act as one telescope, producing more detailed images as the distance between them increases
All types of electromagnetic radiation arranged according to wavelength and frequency
Layer of loose, ground-up rock on the lunar surface
When the Moon passes between Earth and the Sun and the Moon casts a shadow on Earth, blocking Earth's view of the Sun; can be partial or total
Percentage of sunlight that is reflected by the surface of a planet or satellite, such as the Moon
Down
Farthest point in the Moon's elliptical orbit to Earth
Telescope that uses mirrors to focus visible light
Long trail of ejecta that radiates outward form a Moon crater
Closest point in the Moon's elliptical orbit to Earth
The state at which the Moon's orbital and rotational periods are equal
When Earth passes between the Sun and the Moon, and Earth's shadow falls on the Moon; occurs only during a full Moon
Plane of Earth's orbit around the Sun
Period when the Sun is overhead at its farthest distance either north or south of the equator
Heavily cratered regions of the Moon that are light in color and mountainous
Dark-colored, smooth plains on the Moon surface