Purple planets could be hiding extraterrestrial life.

Purple planets could answer extraterrestrial questions

Purple planets could answer extraterrestrial questions

Scientists are convinced that planets which are home to other lifeforms give off a purple hue as a result of the bacteria associated with organisms.

Researchers at Cornell University say that purple bacteria - which are found in some "niches" on Earth - are able to survive in a wide variety of conditions.

The study's co-author Dr. Lisa Kaltenegger said: "We are just opening our eyes to these fascinating worlds around us. Purple bacteria can survive and thrive under such a variety of conditions that it is easy to imagine that on many different worlds, purple may just be the new green."

The expert has called for a database for signs of life so any potential discoveries are not overlooked by boffins.