CAN YOU HEAR ME NOW? Electromagnetic signals (blue circles) from alien civilizations will continue traveling through the Milky Way even after the aliens are gone. The appearance of a doughnut hole represents when a civilization dies out.
STAYIN’ ALIVE This superdry area in the Atacama Desert looks devoid of life. But after a rainstorm, scientists found living microbes in the soil.
D. Schulze-Makuch/Technische Universität Berlin
ITSY BITSY ALIENS Americans would probably welcome the discovery of microbial alien life.