If humans ever receive a message from intelligent aliens, the biggest challenge may not be how far away they are, but how to communicate at all. Our nearest star system is more than four light-years ...

Don't they have something to do ? Even if there were any other life forms in the universe, the distance is far to great to make observation/communication likely. I ...

The following is an extract from our Lost in Space-Time newsletter. Each month, we dive into fascinating ideas from around the universe. You can sign up for Lost in Space-Time here. Modern physics ...