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22 Cards in this Set
- Front
- Back
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the most important instrument used by astronomers |
telescope |
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large lens |
objective lens |
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small lens |
eyepiece |
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a closed tube with an objective lens at the top and an eyepiece at the bottom |
refracting telescope |
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uses a large, curved mirror in place of an objective lens |
reflecting telescope |
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the telescope astronomers usually prefer |
reflecting telescope |
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computer-controlled mirrors that constantly flex and bend to correct for atmospheric distortion are installed between the primary mirror and the camera of a largeg telescope |
adaptive optics |
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can "see" without any atmospheric distortion |
Hubble Space Telescope |
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red, orange, yellow, green, blue, and voilet |
visible spectrum |
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a device that splits light into a spectrum for analysis |
spectroscope |
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an image that records the spectrum produced by a spectroscope |
spectrogram |
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radio waves can be studied using |
radio telescopes |
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discovered that some static comes from radio waves from space |
Karl Jansky |
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the resolution of radio telescope images can be increased dramatically using a technique called |
interferometry |
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the point directly overhead of an observer |
zenith |
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directly below an observer |
nadir |
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the full circle that connects both celestial poles and passes through the observer's zenith |
meridian |
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one rotation of the earth relative to the stars--the amount of time the earth actually takes to spin 360 degrees on its axis |
sidereal day |
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the amount of time between two upper transits of the sun |
apparent solar day |
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the average length of the apparent solar day throughout the year |
mean solar day |
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the difference between mean solar time and apparent solar time is |
the equation of time |
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standard time is based on coordinated universal time/ the mean solar time at the prime meridian |
UTC |
