New results from a decades-old experiment were initially touted as further evidence for dark matter. But independent scientists have cast serious doubt on that claim, leaving most everyone puzzled.
Source: quantamagazine.org
Key technologies include a compact pre-cooler heat-exchanger that can take an incoming airstream of over 1,000C and cool it to -150C in less than 1/100th of a second. This would permit Sabre to use oxygen direct from the atmosphere for combustion instead of carrying it in a tank with the weight penalty that implies.
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Humans aren’t great at picking up their trash, a fact that is reinforced by the Great Pacific garbage patch and other massive dumps and landfills around the world. As it turns out, we are also taking our talent at producing rubbish into orbit with us. Since the advent of spaceflight in the 1950s, outer space has become congested with about 500,000 bits of spacecraft debris measuring larger than a marble, and 20,000 chunks larger than a softball, according to NASA.
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