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Presently he saw the landing grid near the biggest city that half-mile-high, cagelike wall of intricately braced steel girders. It tapped the planet's ionosphere for all the power that this world's inhabitants could use, and applied the same power to lift up and let down the ships of space by which communication with the rest of humanity was maintained.
First they transmitted and we listened, and then we transmitted and they listened, and contact was maintained on ten metres." Norman: "You said 'every evening' do you mean that the Sun has something to do with this type of propagation?" George: "Most certainly. All the contacts that were made subsequently were at least one hour after the relevant part of the ionosphere was in darkness."
He understood from the scientist's explanation that Orion was to travel far into the exosphere, actually beyond the atmosphere, while Cetus was a smaller, single-stage rocket for research in the ionosphere, the ionized layer of atmosphere just beyond the stratosphere. The projects, he realized, were named for constellations. "In this shed we have Pegasus."
It measures the ionosphere height continuously and instantly selects the most appropriate frequency to use to scan the target area, ideally in one hop. The incoming real-time data from these soundings are compared with data stored in computer memory.
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