Jamespenk Posted March 28, 2011 Share Posted March 28, 2011 If i were to stand jupiter now with a telescope would i see life on earth 30 years ago? and if so : 1. if someone at that time was using a telescope and aiming at my exact position, could he see me looking at him? Also, if i was travelling faster than the speed of light and i looked back could i see the past by nanoseconds (etc), could i interact with the past through this method? Link to comment Share on other sites More sharing options...
swansont Posted March 28, 2011 Share Posted March 28, 2011 Since Jupiter is much closer than 30 light-years away, no. But an observer far way could look at you and would see what was happening at a time d/c in the past. Traveling faster than c would, hypothetically, allow you to interact with the past. It violates causality. Link to comment Share on other sites More sharing options...
ajb Posted March 29, 2011 Share Posted March 29, 2011 You will be interested in Roemer's work (1644 -1710). In 1676 he made the first measurements of the speed of light based on careful observations of the moons of Jupiter. Link to comment Share on other sites More sharing options...
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