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Scientists have found out how many planets in the Milky Way can hold life



The Milky Way contains at least 100 billion planets. Scientists go to great lengths to find creatures that may hide life.

The surrounding area of ​​our galaxy may be thriving, but a new study estimates that only 300 million of these 100 billion planets have the correct life composition.

Some of them may be closer than we thought.

The research report has been published on the pre-print server ArXiv and has been accepted for publication in Astronomy Magazine, Provides the most reliable estimate of the habitability in our galaxy so far

Exoplanets come in various shapes and sizes, but only a few are habitable. NASA

Previous speculations about how much the Milky Way might be habitable ranged from as much as 40 billion to as low as 6 billion.

However, using data from exoplanet hunting missions such as Kepler and Gaia, the researchers of this new study claim that their estimates are more accurate.

Jeff Coughlin, SETI Institute’s exoplanet researcher and director of Kepler’s Office of Science, said: “This is the first time that all components have been combined to provide a reliable measurement of the number of potentially habitable planets in the Milky Way.” Co-author of this new study Said in a statement.

Astronomers have three main determinants of habitability. First, they estimated the number of exoplanets in the Milky Way galaxy that are similar in size to Earth-they are most likely rocky planets. Then, they studied how many stars are similar to our sun in age and temperature. Finally, they considered whether the planet has the necessary conditions to support liquid water, a key component of life.

Newer studies show that earlier studies only considered the distance between the planet and the host star to calculate habitability, which is a general measure. Instead, this study also considered how much light a planet would receive from its star from a standpoint of not only distance. The Kepler mission of the National Aeronautics and Space Administration (NASA) zoomed in on stars to see if there were planets orbiting in their habitable zones. At the same time, the European Space Agency’s Gaia mission measured the position, distance and motion of the stars, thereby more accurately estimating the amount of light they emit on the planet-and thus the heat.

Studies have found that there may be 300 million habitable planets in the Milky Way. Data shows that some are only 30 light years away from the sun.

Scientists have confirmed the existence of more than 4,000 exoplanets, although more than 3,000 suspected exoplanets are awaiting confirmation. Some of these planets have shown signs of potential habitability, but whether they can actually live is difficult to determine.

Michelle Kunimoto, a member of the MIT Transit Exoplanet Survey Satellite Team and co-author of the new study, said: “Knowing that different types of planets are very useful for the design of upcoming exoplanet search missions. Value.” In a statement. “Surveys of small planets that may live around stars like the Sun will depend on these results to maximize the chance of success.”

abstract: Based on the Kepler DR25 planet candidate list and Gaia-based star characteristics, we have given the incidence of rocky planets in the main sequence dwarf habitable zone (HZ). We provide the first analysis of interstellar flux related to stars, which allows us to track HZ planets. We define η⊕ as the HZ occurrence of planets with a radius of 0.5 to 1.5 R planets at an effective temperature between 4800 K and 6300 K. We found that the conservative HZ η⊕ is between 0.37 + 0.48 − 0.21 (error reflects 68 % confidence interval) and 0.60 + 0.90-0.36 planets per star, while the optimistic HZ occurs at 0.58 + 0.73- per star Between 0.33 and 0.88 + 1.28-0.51 planets. These boundaries reflect two extreme assumptions about integrity inference beyond the orbital period of the DR25 integrity data. The larger uncertainty is due to the small number of small HZ asteroids detected. We use Poisson-likelihood Bayesian analysis and approximate Bayesian calculation to find similar incidences. Our results are corrected for the completeness and reliability of the catalog. Both completeness and planetary appearance rate depend on the effective temperature of the star. We also introduced the incidence of various star populations and planetary size ranges. We estimate with 95% confidence that, on average, the closest HZ planet to G and K dwarfs is about 6 pc away, and within 10 pc of the sun, it is about 4 HZ rocky planets surrounding G and K dwarfs.


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