As has been noted, the idea that in a hundred + years when intersellar travel is possible, can we not have an idea of planets BEFORE going there? I am not saying there can't be an easter egg, but the idea you have no idea of how many planets or even if they are gas giants is ridiculous. In the last 20, and especially less than 10 years, we are finding planets right and left! Put a limit on size vs range of tech to know, I am good with that. Hell, we will probably practically map Alpha Centauri before we ever start to get there. The came risks being outdated before it is released!
For a lastest reference
http://www.scientificamerican.com/article/wet-exoplanet-has-clear-skies/