'They have decided to take action in the face of huge challenges, displaying not just patience and persistence, but a sense of urgency and determination.'
Nobel Laureate Wangari Maathai on the winners of last night's Ashden Awards.
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...
2 hours ago
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