For more than a century, popular culture has trained us to picture extraterrestrials as bug-eyed, bipedal “little green men” ...

Since the 1950s, humanity has been searching for extraterrestrial life with increasingly sophisticated tools. But after ...

Green is a sign of life on Earth, but other habitable planets could be teeming with purple microbes that we should be able to detect with telescopes. Reading time 2 minutes In a little more than 30 ...