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Planet classification of this sort is only a Star Trek invention. It does not exist in science. "M-class" presumably denoted a planet suitable for earthlings....or Vulcans...or whatever.

So the answer is....right here.

.............

dude what he meant is simply what is the nearest planet that we know of.....aside from earth.... that may have a possibility of being m-class (by the term rich with water and in the "Goldilocks" zone)

by what i have see in a recent set of documentaries they think the nearest planet like that may be 20 light years away... which in the scale of our galaxy inst really too far away XD

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14y ago

What else can I help you with?