The temperature of the thermosphere can reach 2000 K

1. The temperature of the thermosphere can reach 2000 K. Why aren’t astronauts cooked as they “walk” in space?2. What is the density of air at 100 km if the atmosphere has a scale-height of 8 km?(The density at the surface is no = 2.7 X 1019 molecules/cm3)3. What effect would a major solar flare, which emits a large amount of UV and X-ray radiation, have on the dayside ionosphere?4. A satellite re-entering Earth’s atmosphere will suffer a radio communications blackout because of the plasma created by the shock wave in front of it. If the satellite’s radio operates at a frequency of 100 MHz, what is the minimum plasma density during the blackout?5. Describe how space weather impacts airlines.6. The type of orbit (LEO, MEO, HEO, or GEO) a satellite is in depends on its purpose. What are the advantages and disadvantages of LEO and GEO for communication and Earth-observing purposes?7. Where is the center of mass of the Earth–Moon system? (mEarth = 6 ×1024 kg; mMoon = 7 × 1022 kg; distance between Earth and Moon =385 000 km).8. Use Kepler’s third law to determine the radius of the orbit of a Geostationary satellite above the Earth’s surface. The radius of the earth is r_e = 6.38 X 106 meters and its mass is 6.0 X 1024 kilograms.9. Should society be concerned about low-probability events such as asteroid impacts or nearby supernova explosions? We know that there are many natural drivers of climate change. Should society be concerned about global climate change that can take decades to centuries to manifest itself?

 

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