NASA, as well as Russian cosmonauts, have put forth incredible efforts to explore all the planets that we know of. Whether it is through unmanned probes sent to scout out planets or actually sending astronauts to these planets we have explored them all. The only one we have not is Pluto, which is no longer even considered a planet. NASA was faced with a decision in 1977 to send Voyager 1 past Pluto or to explore Saturn’s rings and moon, called Titan. Obviously they opted for Saturn, but the New Horizons probe is expected to reach Pluto by 2015 and put it on the map once and for all.
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