Robotic probes launched by NASA, the European Space Agency (ESA), and others are gathering information for us right now all across the solar system. We currently have spacecraft in orbit around the Sun, Mercury, Venus, Earth, Mars, and sSaturn; several others on their way to smaller bodies; and a few on their way out of the solar system entirely. On Mars, a rover called Spirit has just been officially left for dead, after two years of radio silence from it -- but its twin, Opportunity, continues on its mission, now more than 2,500 days beyond its originally planned 90-days. 38 stunning Images.
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