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There is basically no chance for earth-like planets to form an atmosphere around hot young stars

An artist's idea of ​​the planet HD 219134b, one of the closest rocky exoplanets to our solar system. This planet, which is about 1.6 times the size of the earth, is burning hot, with a partially melted surface. Credit: NASA / JPL-Caltech Previous exoplanet studies suggest that there may be thousands of earth-like worlds in other solar systems, just waiting to be discovered. It's a shame that their atmosphere &#821 1; and with them, any hope of sustaining life – was probably wiped out by their local stars. It is the ruthless removal of a new study published on April 19 in the journal Astronomy and Astrophysics. In the new paper, a team of European researchers created a computer model to simulate atmospheric formation on earth-like planets that revolve around hot, young stars. Since young suns tend to emit extremely large amounts of X-rays and ultraviolet (UV) radiation, most potentially habitable exoplanets will likely see their atmosphere wiped out within 1 million years of Earth's birth. [9 Scientific Excused For Why We Haven’t Found Aliens Yet] "An earth-like atmosphere cannot be formed when the planet enters into a highly active star's livable zone," the researchers wrote in the study. "Instead, such an atmosphere can only be formed after the star's activity has fallen to a much lower level." When astronomers talk about a star's activity, they refer to the amount of radiation emitted. Unlike people and puppies, young stars tend to be highly active, then their activity levels decrease significantly…

An artist’s idea of ​​the planet HD 219134b, one of the closest rocky exoplanets to our solar system. This planet, which is about 1.6 times the size of the earth, is burning hot, with a partially melted surface.

Credit: NASA / JPL-Caltech

Previous exoplanet studies suggest that there may be thousands of earth-like worlds in other solar systems, just waiting to be discovered. It’s a shame that their atmosphere &#821

1; and with them, any hope of sustaining life – was probably wiped out by their local stars.

It is the ruthless removal of a new study published on April 19 in the journal Astronomy and Astrophysics. In the new paper, a team of European researchers created a computer model to simulate atmospheric formation on earth-like planets that revolve around hot, young stars. Since young suns tend to emit extremely large amounts of X-rays and ultraviolet (UV) radiation, most potentially habitable exoplanets will likely see their atmosphere wiped out within 1 million years of Earth’s birth. [9 Scientific Excused For Why We Haven’t Found Aliens Yet]

“An earth-like atmosphere cannot be formed when the planet enters into a highly active star’s livable zone,” the researchers wrote in the study. “Instead, such an atmosphere can only be formed after the star’s activity has fallen to a much lower level.”

When astronomers talk about a star’s activity, they refer to the amount of radiation emitted. Unlike people and puppies, young stars tend to be highly active, then their activity levels decrease significantly as they age. The exact activity levels of different ages depend on the star’s mass.

In the case of M dwarf stars – which are slightly smaller than the Earth’s sun and believed it to be the dominant star of the nearby solar system – it may take several billion years before the solar activity decreases to levels comparable to Earth’s Sun today. During that time, the researchers found that any exoplanet that was banned in the inhabited zone around such a star would be bombed with so much radiation that there would be little chance of an atmosphere surviving the first 100,000 years.

As a result, most soil-like exoplanets discovered around M dwarf stars in nearby solar systems probably have very thin atmospheres or none at all, the scientists concluded, leaving the surfaces of these planets exposed to the punitive effects of solar radiation. Unfortunately, this means that life on even the most habitable planets can be rare than previously thought.

Originally published on Live Science .


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