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I did some research and I think I can answer my question myself now, after all. I hope you find it interesting. As it turns out, the technology of the Kepler space telescope would indeed allow detection of all Solar system planets except Mercury and probably Mars, i.e. all of them are big enough to be seen by it from a distance of about 2,000 ly. However, ...


Well the light which is reaching there now, the light which is being detected by a telescope set up in the Kepler planets was emitted from the Sun's solar system 2000 years ago since light took 2000 years from here to reach Kepler planets. So any event which occurred 2000 years ago in our solar system will be visible now in the Keplers. If we are (somehow) ...

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