Extraterrestrial Life
Most Aliens May Be Artificial Intelligence, Not Life as We Know It
Human intelligence may be just a brief phase before machines take over. That may answer where the aliens are hiding
Stories by Martin Rees
Space & Physics
How Astronomers Revolutionized Our View of the Cosmos
The universe turns out to be much bigger and weirder than anyone thought
Do We Really Need to Send Humans into Space?
Automated spacecraft cost far less; they’re getting more capable every year; and if they fail, nobody dies
Stephen Hawking: An Appreciation
A friend and colleague who knew Hawking for more than 50 years reflects on an extraordinary life
Space & Physics
Exploring Our Universe and Others
This Century cosmologists will unravel the mystery of our universe's Birth-and perhaps prove the existence of other universes as well
Space & Physics
Exploring Our Universe and Others
In the 21st century cosmologists will unravel the mystery of our universe's birth-and perhaps prove the existence of other universes as well
