From the episode The Enemy Within which is set before the Enterprise took on its shuttlecraft... or there was something in the atmosphere that prevented the shuttles from landing and they didn’t mention it on screen because to them it was so bloody obvious why would you even bring it up?!?!
This is part of the Star Trek 366 project celebrating 50 years of Star Trek through an illustration a day - for more details visit: http://leedrawsstuff.com/star-trek-366/
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