"Our Milky Way has as many as 400 billion stars, with seven per cent of them being G-type," Jaymie Matthews, astronomer at the University of British Columbia, and co-author of a new study about the findings in The Astronomical Journal, said in a statement. "That means less than six billion stars may have Earth-like planets in our Galaxy."
By definition, Earth-like planets must be roughly the size of our planet and also be located in the habitable zone of their host star system — the distance at which a planet has the potential to hold liquid water, and therefore life.
"Estimating how common different kinds of planets are around different stars can provide important constraints on planet formation and evolution theories, and help optimize future missions dedicated to finding exoplanets," Michelle Kunimoto, and UBC researcher and co-author, said in the statement.
Kunimoto and collaborators used an algorithm to compare lists of planets previously detected by NASA's planet-hunting Kepler space telescopes to ones that popped up when populating potential exoplanets orbiting stars found by Kepler.
The researchers also looked at the "radius gap" of exoplanets, which is the fact that it's unlikely for planets that orbit their star in less than 100 Earth days to be between 1.5 and two times that of Earth.
They found that the range of orbital periods represented by the "radius gap" was actually much narrower than previously thought, which could help us fill the gaps in our understanding of how planets evolve over time.
This article was originally published in Futurism.
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