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In Reply to: Small bug in that script... posted by orejones on December 10, 2003 at 03:38:30:
The spacecraft does not have to travel anywhere near light speed in order to make the trip from our detectable limits (not knowing that it's out there headed towards us) to being within Earth orbit distance (opposite the Sun) within a few days. The earth travels an angular displacement of only a few degrees within that time; and since to detect it we would have to be looking directly through the sun to see it for most of that time -- it can get in. But thank you for your input, at least you entertained the thought, and that's what counts!
Follow Ups:
Look at the distances involved (Jupiter is some 800 billion kilometers from Earth...) and then consider that nothing is staying quiet in the Solar System, but spinning around Sun at veeery high speeds..., and the farther it comes from, the smaller the angular displacement needed to detect it, even if there were no satellites around, or something like good old Hubble...And then, that ship would need to lower its speed when coming in, or would never be able to enter any decent orbit: that all requires time, doesn´t it?
Regards
BF
I have addressed your concerns in two earlier replies -- but due to the way replies are posted, the first one lies below the second.
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