NASA had a ion propelled asteroid flyby probe called [ame="http://en.wikipedia.org/wiki/Deep_Space_1"]Deep Space 1[/ame]. [ame="http://en.wikipedia.org/wiki/Deep_Space_2"]Deep Space 2[/ame] was a miniprobe, part of the Mars Polar Lander (which crashed). Deep Space 3 was going to be a "stellar optical interferometer," and Deep Space 4 was going to be a comet lander; both were cancelled before they came to fruition.
They should have kept going until they reached 9.
They should have kept going until they reached 9.
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