Recently, astronomers came to know the number of planets capable of hosting life, outside our solar system.
Although a research paper published last year confirmed the possibility of 300 million planets in our galaxy, which may be habitable, new research published its results in the Journal of the Royal Astronomical Society denied this.
According to the new research, scientists have so far found 4,422 exoplanets Sun GroupHowever, few of them are habitable, based on an assessment of the phenomenon of “photosynthesis”, which is the use of sunlight, water and carbon dioxide by plants to produce oxygen.
Given that ‘photosynthesis’ was critical in enabling a complex biosphere of the type found on Earth, the possibility that a planet outside the solar system is habitable, therefore, means that it will develop an atmosphere based on oxygen.
According to Forbes magazine, telescope The James Webb spacecraft, scheduled to launch later this year, will enable scientists to study Atmosphere For other planets, the light from the atmosphere will reveal the gases they contain.
The researchers believe that by measuring the amount of solar radiation received by each exoplanet, it was found that the planet “Kepler 442b” would receive enough sunlight to maintain a biosphere capable of hosting life.
The rocky planet, about twice the mass of Earth, orbits a moderately hot orange dwarf star about 1,120 light-years away in the constellation Lyra.
According to the published research, planets that are about half as hot as our sun cannot maintain an Earth-like biosphere, because they do not provide enough energy in the correct wavelength range.
This does not mean thatPhotosynthesis“It would be possible, but there would not be enough plant life on the planet, to maintain an Earth-like biosphere.
The researchers noted that 70 percent of the stars in the galaxy Milky Way They are “dark red dwarf” stars, meaning that they do not give their planets enough sunlight for the process of “photosynthesis”.
The research stressed that stars that are hotter and brighter than our sun can theoretically provide more “photosynthesis” conditions, but these stars do not exist long enough for complex life to develop.
According to Professor Giovanni Covoni from the University of Naples, “Given that red dwarfs are the most common type of star in our galaxy, this result suggests that Earth-like conditions on other planets may be less common than we might hope.”
“This study places strong constraints on the space for complex life, and unfortunately it appears that the right place to host a rich, Earth-like biosphere is not very extensive,” Covoni added.
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