Flights are the fastest-growing polluter in transport, and 95% of the world’s population has never been on a plane.
My Going Green column asks: Do the rest of us have a right to fly?
Knot theory could help spacecraft navigate crowded solar systems
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It can be difficult to figure out how to move a spacecraft from one orbit
to another, but a trick from knot theory can help find spots where shifting
orbit...
5 hours ago
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