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Hello all,

I was just watching a video about the Kepler Space Telescope. The narrator said that there are up to nine billion planets in our galaxy which are roughly the same size as Earth and with the same potential for liquid water.

If, in the future, we were to visit one or several of these planets, how would we navigate around their surfaces? With INS, celestial, some other method or a combination of these?

If the primary means were celestial, how hard would it be to work out an almanac for a distant planet? How about refraction corrections? (I assume dip would be the same.)

Just curious about everyone's thoughts on this.

-Sean C.
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