Extraterrestrials may spout out toxic gas as a sign of life, researchers suggest
FOXNews - Wed 26 Jun 19As the search for intelligent extraterrestrial life marches on, researchers have suggested no shortage of possible signs to look for, including carbon monoxide, dust storms and methane, which ...
On Alien Worlds, Extraterrestrials Could Be Spewing a Toxic, Smelly Gas. That's How We Could Find Them.
SPACE.com - Wed 26 Jun 19Phosphine, a horrible-smelling gas that's toxic to life on Earth, could signal the existence of alien life-forms elsewhere in the universe.
On Alien Worlds, Extraterrestrials Could Be Spewing a Toxic, Smelly Gas. That's How We Could Find Them., Livescience - Tue 25 Jun 19