It could take NASA more than a decade to send a mission to Enceladus.
Multi-planetary civilizations need an amazing amount of energy, and there may be only one way to get it.
Contact, however, may still be years (if not light years) away.
Here's a rundown of what the world's greatest minds think.
We have a long way to go, but this is a big step in the right direction.
And it could reveal how life on Earth came to be.
What stands in the way of discovering intelligent alien life?
Is there anybody out there?
The signal from space had astronomers stumped for 40 years. They finally have an answer.
Extraterrestrials may be biding their time, waiting for a more ideal universe.
Over 350,000 people subscribe to our newsletter.
Sign in to join the conversation.