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10 cards from this deck
Karl Jansky
Atmosphere transparent to radio wavelengths
Parabolic dish antenna
θ≈λD\theta \approx \frac{\lambda}{D}θ≈Dλ
Radio waves have long wavelengths (metres)
Arecibo, Puerto Rico
Can operate continuously day and night
30 MHz (ionosphere absorption)
60 GHz (water vapour absorption)
Can penetrate thick dust clouds
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