An observer looking at Earth's past history

[happyhacker]

I was thinking about the signals Mankind has sent out from Earth greeting other races out there. Is it reasonable to think that even if some being received the signals (data) they would have no idea about locating Earth because it would be in somewhere else in the Galaxy/Universe by then?

So some people's worry about giving a conquering race our coordinates is groundless and a waste of effort anyway unless by some Galactic or Cosmological reference one can compute the path. I do not have the knowledge to apply any maths to this even if there is any.

 

[Borg]

The Earth doesn't travel that far with respect to the galaxy. We would be easily locatable as long as they can pick up the signal.

 

[DrClaude]

Also, the motion of the Earth and the Solar System is quite predictable. It would be no problem for the aliens to figure out where the emitter that sent the signal is currently located.

 

[Grinkle]

http://www.planetary.org/blogs/emily-lakdawalla/2012/3390.html

The above seems to be a popular image showing how small ~100 LY is on the galactic scale. Its a huge galaxy relative to how far our transmissions have gone, and they don't have a lot of power in them.