Despite High Radiation Levels Nearest Exoplanets Can Support Life

Despite High Radiation Levels Nearest Exoplanets Can Support Life 1

Researchers compared atmosphere and models of with of nearly 4 billion ago to today. 4 billion ago the Earth had a lot more radiation but life still existed and started at that time.

Monthly Notices of the Royal Astronomical Society Lessons from early Earth: UV surface radiation should not limit the habitability of active M star systems

Nearby exoplanets are receiving higher UV radiation than that emitted by our own sun today but the radiation is significantly lower than what Earth received 3.9 billion years ago.

To judge the potential habitability of with varying rates of radiation influx, the researchers assessed the mortality rates at different UV wavelengths of the extremophile Deinococcus radiodurans, one of the most radiation-resistant organisms known.

Not all wavelengths of UV radiation are equally damaging to biological molecules. A dosage of UV radiation at 360 nanometers would need to be three orders of magnitude higher than a dosage of radiation at 260 nanometers to produce similar mortality rates in a population of this organism.

Despite High Radiation Levels Nearest Exoplanets Can Support Life 2

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