- #1
Quotidian
- 98
- 14
- TL;DR Summary
- How far can laser control of a small spacecraft extend?
I've been reading about Yuri Milner's 'Breakthrough Starshot'. It posits sending a very small craft, less than 1 gram, to Alpha Centauri, by way of a lightsail propelled by an array of lasers fired from Earth. It is proposed that this craft will be able to reach 30% of light speed, i.e. around 100 million kph, and would reach its destination in about 20 years at that speed. Once there, it would send back data on the planets orbiting that star, by signals that would take four years to reach Earth (that system being four light-years distant.)
I'm very interested in this idea and have spent some time perusing their website, but there's one obvious question that strikes me, which is, how far could control be extended by way of a laser beam fired from earth? Surely not the hundreds of billions, or trillions, of kilometers that would seem to be required by this proposal? It seems an obvious defeater for the idea but maybe there's something I don't understand about it.
I'm very interested in this idea and have spent some time perusing their website, but there's one obvious question that strikes me, which is, how far could control be extended by way of a laser beam fired from earth? Surely not the hundreds of billions, or trillions, of kilometers that would seem to be required by this proposal? It seems an obvious defeater for the idea but maybe there's something I don't understand about it.