SpaceEarly Earth’s air may show us how to find signs of alien life Oxygen isn’t the best beacon of life on an alien world. We need to look for other gases organisms spew into the air, and early Earth can show us what to target 51¶¯Âþ
SpaceThe message we're sending to nearby aliens is no threat to Earth Critics fear provoking hostile extraterrestrials by beaming messages to our closest exoplanets but there's no need to worry, says METI president Douglas Vakoch Comment