While fields, forests and jungles have made green the color most associated with ... ludicrous to think that another habitable planet could be, say, purple. Start the day smarter.

If an Earth-like planet was orbiting another star, however, it may look different than our precious pale blue dot. In fact, it could don a daring shade of purple. A group of researchers from the ...

The purple color that the organisms sported with this retinal photosynthesis ... These ancient microbes may have turned the planet purple before plants took over. During the earliest days of the Earth ...