Kepler

Aliens are listening for signals from Earth. Illustration: depositphotos.com

Can aliens discover us? New research explains

What could aliens pick up from the radio leak from Earth? How would Earth look to an alien civilization light years away from us?
Kalachao Siyum, a doctoral student at the University of Arizona, of Ethiopian origin, presents the jawbone he discovered at a site in the Afar state in Ethiopia, which dates back the first species in the human lineage to 2.8 million years. Photo: Arizona State University

Summary of the year 2015 in science