The Milky Way galaxy could be a much wetter place than we knew.
A new analysis of exoplanets orbiting red dwarf stars suggests that we may have been missing a population of"water worlds" – soggy planets whose composition consists of up to 50 percent water.; scientists expect that, for many of them, the water will be bound up in hydrated minerals. However, the finding may have implications for our search for life outside the Solar System.
Their low fusion rate gives them the largest longevity of all stars; at 13.8 billion years old, the Universe isn't old enough for a red dwarf star to have lived out its entire, estimated 100 billion-year lifespan. Because they're so dim and red, finding exoplanets in orbit around red dwarfs is difficult. Just a small percentage of theHowever, our instruments are growing ever more sophisticated – enough so that scientists have been able to characterize dozens of small worlds orbiting these small stars.
The second is a minute lengthening and shortening of wavelengths of light from the star, as the orbiting exoplanet exerts a faint gravitational pull.
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