ADVERTISEMENT
See Inside July 2000

Where They Could Hide

Maybe we are alone in the galaxy after all. The galaxy appears to be devoid of super civilizations, but lesser cultures could have eluded the ongoing searches
Scientific American Holiday Sale

Scientific American Mind Digital

Get 6 bi-monthly digital issues
+ 1yr of archive access for just $9.99

Hurry this offer ends soon! >

X

Email this Article

X

Next Article