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23 Cards in this Set
- Front
- Back
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What Causes Seasons? |
The Tilt of Earth's axis |
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What Causes Tides? |
caused mainly by differential gravitational force exerted by Moon |
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Coriolis effect
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caused by Earth’s rotation (deflection of missile, jet streams, ocean currents, trade winds,spiral pattern of storm)
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Aurora
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charged particles from Solar wind guided by Earth’s magnetic field make atmosphere glow (AuroraBorealis or Northern Lights, Aurora Australis)
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Spring Tides |
Just after a full or new moon where the tides are at their strongest caused by the sun having its greatest impact on the tides |
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Neap Tides |
Just after a first and third quarter moon where the tides are at their weakest
caused by the sun having its greatest impact on the tides |
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Constellations |
groupings of stars in same part of sky, but in no way related |
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collecting area of optics |
depends on lens/mirror diameter and affects image brightness |
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resolution: |
determines the image clarity, theoretically better with larger diameter optics (but theoreticalresolution vs. atmospheric blurring or “seeing” is a factor) |
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telescope focal length |
determines the image scale |
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eyepiece focal length: |
for optics of a given focal length, determines the magnification or power |
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f-value (or “focal ratio”) |
telescope focal length divided by diameter of lens/mirror |
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Refracting Telescope: |
uses a lens (lens may suffer from chromatic aberration) |
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Reflecting Telescope: |
uses a mirror (mirror may suffer from spherical aberration) |
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Combination Telescope: |
uses lenses and mirrors (e.g., Schmidt Telescope, Schmidt-Cassegrain Telescope) |
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equatorial mounts: |
can track stars |
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alt-azimuth mount: |
point main axis to zenith (overhead) |
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spectrograph: |
records spectrum *intensity vs. wavelength) |
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photometer: |
records intensity or image (overall brightness in some colored filter) |
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What types of radiation does ozone absorb |
gamma rays, x-rays, and UV light |
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What types of radiation does water absorb |
IR light |
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Planets that are easy to see without a telescope |
Venus, Mars, Jupiter, Saturn |
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Difficult (or impossible) to see without a telescope |
Mercury, Uranus, and Neptune |
