The idea of the Earth once being a purple world has the “Purple Earth” hypothesis behind it, a speculation that the earliest forms of life on Earth had a different molecule instead of chlorophyll ...

What does a flower look like to a hummingbird? New research says it’s probably nothing like what humans perceive, because ...

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 ...

Before plants ruled, Earth may have glowed violet. The first life forms used retinal instead of chlorophyll, absorbing green light and reflecting red and blue—turning the planet an eerie purple.