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Chapter 27

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Across
1
Material that falls back to the lunar surface after being blasted out by the impact of a space object
5
Telescope that uses lenses to focus visible light
8
Valleylike structure that meanders across some regions of the Moon's maria
9
Crater formed when space material impacted on Moon's surface
11
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
12
Process that links separate telescopes so they act as one telescope, producing more detailed images as the distance between them increases
13
All types of electromagnetic radiation arranged according to wavelength and frequency
16
Layer of loose, ground-up rock on the lunar surface
19
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
20
Percentage of sunlight that is reflected by the surface of a planet or satellite, such as the Moon
Down
2
Farthest point in the Moon's elliptical orbit to Earth
3
Telescope that uses mirrors to focus visible light
4
Long trail of ejecta that radiates outward form a Moon crater
6
Closest point in the Moon's elliptical orbit to Earth
7
The state at which the Moon's orbital and rotational periods are equal
10
When Earth passes between the Sun and the Moon, and Earth's shadow falls on the Moon; occurs only during a full Moon
14
Plane of Earth's orbit around the Sun
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Period when the Sun is overhead at its farthest distance either north or south of the equator
17
Heavily cratered regions of the Moon that are light in color and mountainous
18
Dark-colored, smooth plains on the Moon surface