alien life

"I was not at his side while he lay on his deathbed, by choice. I chose not to hear his last words, and that’s hard for me to accept."
The big question: Did they leave artifacts behind for us to find?
He started writing it just weeks after Britain entered WWII.
"We really do know that pretty much every star in the sky hosts at least one planet," says astronomer Adam Frank.
Columbia University astronomers say their laser plan would work, but others aren't so sure.
It will be able to detect and receive signals from outer space and help search for extraterrestrial intelligence.
"Life could spread from host star to host star in a pattern similar to the outbreak of an epidemic."