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Recent exoplanet surveys suggest that there might be thousands of Earth-like worlds in other solar systems, just waiting to be discovered. It's too bad that their atmospheres — and, with them, any hope of sustaining life — were probably obliterated by their local stars.
"An Earth-like atmosphere cannot form when the planet is orbiting within the habitable zone of a very active star," the researchers wrote in the study. "Instead, such an atmosphere can only form after the activity of the star has decreased to a much lower level."
Beast - 'Game - Thrones - Houses - Would
Which Beast from the 'Game of Thrones' Houses Would Win?
In a battle between animals representing the most powerful houses in "Game of Thrones," which beast would best the others?
Astronomers - Activity - Star - Amount - Radiation
When astronomers talk about the activity of a star, they're referring to the amount of radiation emitted. Not unlike humans and puppies, young stars tend to be highly active, then significantly decrease their activity levels as they age....
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