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Unformatted text preview: 7. The face is coincidental match between humans curiosity and expectation with unusual surface structure on Mars. 8. Biologically important molecules signal their presence by decomposing into carbon dioxide at lower temperatures. 9. Even if only a few alien civilizations are scattered across the Galaxy, we have the technology to detect radio transmissions from them. The frequency gap is called the water hole, in which this microwave spectrum is fairly free of interference from extraneous sources. 10. The rationale is that stars like the Sun emit much less infrared radiation than visible light, while planets are relatively strong emitters of infrared. Putting up telescopes to detect infrared radiation would be necessary. Advanced Questions 11. 550 nm, minimum diameter would be 3.7m 12. 1000 civilizations, 10,000 years 1,000,000 civilizations, 10 million years 16. 6000 km with 10 mm wavelength 3.22 parsecs from Earth = 200 km...
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- Winter '07