Jonathan O’Callaghan at the BBC:
High in the skies of Earth, a new space race is underway. Here, just above the boundary where space begins, companies are trying to create a new class of daring satellites. Not quite high-altitude planes and not quite low-orbiting satellites, these sky skimmers are designed to race around our planet in an untapped region, with potentially huge benefits on offer.
Roughly 10,000 satellites are orbiting our planet right now, at speeds of up to 17,000mph (27,000km/h). Every one of these delicate contraptions is in constant free-fall and would drop straight back down to Earth were it not for the blistering speeds at which they travel. It’s their considerable sideways momentum, perfectly stabilised against the Earth’s gravitational pull downwards, that keeps satellites in orbit.
A new class of satellites is aiming to push the limits of this balancing act and plough a much more precarious, lower orbit that would skim the top of Earth’s atmosphere.
More here.
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