ADVERTISEMENT

Why ET Hasn't Called

The lifetime of civilizations in the Drake equation for estimating extraterrestrial intelligences is greatly exaggerated
Michael Shermer



BRAD HINES

THIS ARTICLE IS ONLY AVAILABLE AS A PDF.
or subscribe to access the full article.
Buy Digital Issue $7.99
Print + Digital
All Access
$99.99 Subscribe
Share this Article:

Comments

You must sign in or register as a ScientificAmerican.com member to submit a comment.

Email this Article

X