Chapter 27 Vocabulary

8. process that links separate telescopes so they act as one telescope, producing more detailed images as the distance between them increases.
11. dark-colored, smooth plains on the Moon surface.
13. the state at which the Moons orbital and rotational periods are equal.
14. when Earth passes between the Sun and the Moon, and Earths shadow falls on the Moon; occurs only during a full moon,
15. layer of loose, ground-up rock on the lunar surface.
17. telescope that uses mirrors to focus visible light.
18. time of year during which Earth's axis does not point directly toward the Sun; both hemispheres receive exactly 12 hours of sunlight.
19. plane of Earth’s orbit around the Sun.

1. light-colored, mountainous, heavily cratered area of the Moon, composed mostly of lunar Breccias.
2. closest point in the Moon’s elliptical orbit to Earth.
3. percentage of sunlight that is reflected by the surface of a planet or a satellite, such as the Moon.
4. all types of electro- magnetic radiation arranged according to wave- length and frequency.
5. valley-like structure that meanders across some regions of the Moons Maria.
6. material that falls back to the lunar surface after being blasted out by the impact of a space object.
7. crater formed when space material impacted on Moons surface.
9. farthest point in the Moons elliptical orbit to Earth.
10. long trail of ejecta that radiates outward from a Moon crater.
12. telescope that uses lenses to focus visible light.
13. 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.
16. the Sun is overhead at its farthest distance either north or south of the equator.