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Planetary Astronomy Unit 1 Key Terms
Key Terms and Matching Definitions
1. Short for "picture element" and is one square
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adaptive optics
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astronomical unit
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constellation
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crescent Moon
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ecliptic
in a grid of light sensing elements.
2. The distance light travels in a year.
3. The times it takes for the Moon to orbit
360o around the Earth; 27 1/3 days.
4. The blocking of all or part of the Sun's disk
by the Moon.
5. The distance from a lens or mirror to where
the converging light rays meet.
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eyepiece lens
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focal length
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light year
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lunar eclipse
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lunar month
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parallax
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pixel
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Polaris
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powers of ten
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reflection
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refraction
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sidereal month
6. The bending of light rays as they pass from a
medium of one index of refraction to a medium
with another.
7. The apparent displacement of an object as
compared to more distant objects as a result of
viewing the object from different locations.
8. A telescopes optical system that is continuously and automatically adjusted to
compensate for the distortion caused by the Earth’s atmosphere.
9. A configuration of stars often named after an object, a person or an animal.
10. The blocking of all or part of the sunlight on the Moon by the Earth.
11. A method for writing large and small numbers that uses a number between 1
and 10 multiplied by a power of ten, also known as scientific notation.
12. The average distance between the Earth and the Sun.
13. The annual path of the Sun across the celestial sphere.
14. A magnifying lens used to view the image produced at the focus of a telescope.
15. A lunar phase during which the Moon appears less than half full.
16. The rebounding of light rays off a smooth surface.
17. The North Star, the star that appears nearly at the North celestial pole.
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solar eclipse
18. The time from one full moon to the next; 29 1/2 days.