We are circling a planet that is an exact copy of earth. Exact. Yes, exact. What a coinky-dink! Now, beyond the weird factor this would seem to raise all kinds of existential questions but we obviously have no time for those. I mean, really, the captain is just so pragmatic. This is directly from his log: "Captain's Log, stardate 2713.5. In the distant reaches of our galaxy, we have made an astonishing discovery. Earth type radio signals coming from a planet which apparently is an exact duplicate of the Earth. It seems impossible, but there it is." Really, Jim: "...but there it is."
So, we're getting distress signals from a strange copy of earth; what's the logical next step? If you guessed to send our captain, the second in command AND the chief medical officer down to the planet below with the captain's personal yeoman and a minimal security detail, then you guessed right. Did I mention that they took the CHIEF MEDICAL OFFICER? I have got to look up protocol on away missions and see if I can figure out policy.
I hate to say "I told you so" because now, everyone in the landing party has some horrible flesh-eating disease that is just the most awesome shade of blue! At least we are safe here on board--bereft of leadership, excluding Scotty and I of course. Oh well...