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.
Source: co.uk
Dark matter and galaxies normally go hand in hand. Dark matter seems to be needed to draw in sufficient material to form the galaxy and its stars, and halos of dark matter keep galaxies from spinning apart as they rotate. So scientists were more than a bit surprised to find a galaxy that has little to no dark matter at all.
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Thethrusters aboard the Voyager 1 spacecraft just did what we thought was impossible. After 37 years of inactivity,NASA just received response from spacecraft 13 billion miles away, NASA said in a statement on its website. Voyager 1 is NASA’s farthest and fastest spacecraft.
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