One-third of galaxy's most common planets could be in habitable zone PNASNews
would need to huddle very close to their small stars, which leaves them susceptible to extreme tidal forces.
In a new analysis based on the latest telescope data, University of Florida astronomers have discovered that two-thirds of the planets around these ubiquitous small stars could be roasted by these tidal extremes, sterilizing them. But that leaves one-third of the planets—hundreds of millions across the galaxy—that could be in a goldilocksUF astronomy professor Sarah Ballard and doctoral student Sheila Sagear published their findings the week of May 29 in the.
"I think this result is really important for the next decade of exoplanet research, because eyes are shifting toward this population of stars," Sagear said."These stars are excellent targets to look forin an orbit where it's conceivable that water might be liquid and therefore the planet might be habitable."
Sagear and Ballard measured the eccentricity of a sample of more than 150 planets around these M dwarf stars, which are about the size of Jupiter. The more oval shaped an orbit, the more eccentric it is. If a planet orbits close enough to its star, at about the distance that Mercury orbits the sun, an
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