February 3, 2026 at 3:48 pm
There’s A Recorded Message From Carl Sagan Waiting On The Surface Of Mars For The First Humans To Visit
A message of hope in a time of uncertainty.
A message of hope in a time of uncertainty.
Sagan was such a pioneer.
Sagan was an absolute legend!
Carl Sagan explains how the ancient Greeks knew the Earth was round and calculated its circumference over 2,000 years ago.
In this excerpt from episode 1 of Carl Sagan’s ‘Cosmos’, he explains how the Greek scholar, Eratosthenes, knew the Earth was curved over 2,200 years ago
Page 1 of 1
Sign up to get our BEST stories of the week straight to your inbox.
