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Earth is the planet of the plants--and it all can be traced back to one green cell. The world's lush profusion of photosynthesizers--from towering redwoods to ubiquitous diatoms--owe their existence to a tiny alga eons ago that swallowed a cyanobacteria and turned it into an internal solar power plant. [More]

Scientists have discovered the coldest type of star-like bodies known, which at times can be cooler than the human body. Astronomers had unsuccessfully pursued these dark entities, called Y dwarfs, ever since their existence was theorized more than a decade ago. They are nearly impossible to see relying on visible light, but with the infrared vision of NASA's WISE space telescope , researchers finally detected the faint glow of six Y dwarfs relatively close to our sun, within a distance of about 40 light-years