'Buzzkill of science' Neil deGrasse Tyson explains why zombies are purely fantasy
Neil deGrasse Tyson on 'The Daily Show' on Nov. 14, 2013. [Comedy Central]

Have no fear of the coming zombie apocalypse, astrophysicist and "buzzkill of science" Neil deGrasse Tyson told America on Thursday night's The Daily Show.

It's not happening. Zombies apparently defy the known laws of physics and physiology.

"Without a functioning circulatory system distributing oxygenated blood, a zombie's muscles would succumb to rigor mortis," Tyson explained.

"They couldn't even stand, let alone walk."

And they would have no desire to eat brains -- or anything else -- because their bodies would not be producing the hormone leptin.

Human zombies just couldn't happen.

Spaces zombies, however, are another story.

"I'm a scientist," Tyson said. "I have to be open to every possibility."

Watch video, courtesy of Comedy Central, below: