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For the sake of clarity here, nobody is seriously considering actually sending anything to 55 Cancri. We're just not that good yet; anything we built would be fast enough to get there within a reasonable timeframe. The planet itself is incapable of supporting life as we understand it and while there is a possibility of moons we're a very long way off from actually being able to detect them.
No, the sole reason this is significant is because of the location of the planet's orbit, which is direct evidence that planets other than Earth have formed within the proper zone to have water in liquid form. While that may not actually seem like that much to get worked up about, until now we didn't actually know if our little ball of dirt was unique in that regard.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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