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could we shine a laser on this new solar system and detect somethingin 180 years?



 
 
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Old July 10th 03, 04:54 PM
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Default could we shine a laser on this new solar system and detect somethingin 180 years?



Tony Rusi wrote:

http://news.independent.co.uk/world/...p?story=421468


Not practically.

It's is only just possible to detect a laser beam bounced off the moon.
Thanks to the monostatic radar equation, doubling the distance between
the transmitter/receiver and the target would reduce the size of the
received
signal by a factor of 16. Trebling the distance reduces the signal by
a factor of 81, and so on.

Ninety light years is over one billion times the Earth-Moon
distance.

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