Barnard's Star is a small, dim star of the type that astronomers call red dwarfs. Consequently, even though it is one of the ...

"We think about green plants and then blue oceans ... such bacteria could be primed to thrive on planets that circle cooler red dwarf stars – the most common type in our galaxy.

Thanks to this method, we have discovered many planets in orbit around certain stars. Trappist-1, a red dwarf star located 40 light-years from Earth, has seven Earth-sized planets that all transit ...

Yet retinal was first, hinting at an ancient evolutionary showdown between green and purple life. Astrobiologists say purple planets might be easier to spot than green ones. If alien life uses ...