You've consumed enough science fiction to know something the average red shirt doesn't: Never take your space helmet off on a foreign planet. But if you're still tempted to breathe deep the gathering gloom, how about five compelling scientific reasons not to? Join Robert and Joe as they discuss "Alien: Covenant" and explore some very compelling biological and radiological reasons to remain helmeted on an alien hell world. (Originally published May 25, 2017)
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