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June 14, 2021
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According to NASA, more than 4,500 exoplanets have been discovered, with only a small portion thought to have the properties to contain life. A new study, however, suggests that the galaxy may actually contain 300 million planets capable of supporting life.
The research analyzed data from the Kepler Space Telescope and found approximately half the stars that have a similar temperature to the sun, fluctuating up to 1500 Fahrenheit, which could also be orbited by rocky planets with sustainable liquid water on their surface.
“Kepler already told us there were billions of planets, but now we know a good chunk of those planets might be rocky and habitable,” said the study’s lead author, Steve Bryson, in a statement. “Though this result is far from a final value, and water on a planet’s surface is only one of many factors to support life, it’s extremely exciting that we calculated these worlds are this common with such high confidence and precision.”
There are 3 basic needs of life on an exoplanet. Fuels of various Hydro-Carbon such as Methane provides energy for metabolic activities. Nitrogen for various Nitrogenous organic molecules such as various amino acids for the growth of organisms. But, the most important need is liquid water. Water remains in liquid form if a planet revolves its star in the “Habitable Zone.”
The new study, which is slated to be published in The Astronomical Journal, looked at the relationship between the temperature of the star and the light an orbiting planet absorbed, expanding the scope of researchers. “We always knew defining habitability simply in terms of a planet’s physical distance from a star, so that it’s not too hot or cold, left us making a lot of assumptions”, said study co-author Ravi Kopparapu. “Gaia’s data on stars allowed us to look at these planets and their stars in an entirely new way.” Kopparapu added, “Not every star is alike, and neither is every planet.”
In the data, the researchers also said there are “at least four” potentially habitable exoplanets within 20-30 light-years from the Earth. “To me, this result is an example of how much we’ve been able to discover just with that small glimpse beyond our Solar System”, Bryson, a researcher at NASA Ames Research Center, added. “What we see is that our galaxy is a fascinating one, with fascinating worlds, and some that may not be too different from our own.”
In October, a separate group of researchers discovered 24 potential “super habitable” planets that may have conditions more suited to host life.
ARTICLE: PATEL CHAITANYA
SCIENCE/HEALTH EDITOR: KYLE SMITH