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

The search for life beyond Earth requires expanding the very definition of what life can be. Some exoplanets, especially those orbiting cooler red dwarfs, might host purple plant life rather than the ...

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 ...