Resilience of life to Astrophysical Events

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In summary, the authors discuss the statistics of events that could completely sterilize an Earth-like planet with a planet radius of 0.5-1.5R⊕ and temperatures of 300K. They find that although human life is fragile to nearby events, the resilience of Ecdysozoa such as Milnesium tardigradum renders global sterilisation an unlikely event.
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https://www.nature.com/articles/s41598-017-05796-x

Abstract:
Much attention has been given in the literature to the effects of astrophysical events on human and land-based life. However, little has been discussed on the resilience of life itself. Here we instead explore the statistics of events that completely sterilise an Earth-like planet with planet radii in the range 0.5–1.5R⊕ and temperatures of ∼300 K, eradicating all forms of life. We consider the relative likelihood of complete global sterilisation events from three astrophysical sources – supernovae, gamma-ray bursts, large asteroid impacts, and passing-by stars. To assess such probabilities we consider what cataclysmic event could lead to the annihilation of not just human life, but also extremophiles, through the boiling of all water in Earth’s oceans. Surprisingly we find that although human life is somewhat fragile to nearby events, the resilience of Ecdysozoa such as Milnesium tardigradum renders global sterilisation an unlikely event.

Milnesium is a tardigrade. They can resist severe dessication, extreme heat, and extreme cold.
 
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We have microbes living under kilometers of rock. Heating the whole surface of Earth for a long time is the only realistic way to kill them.
 
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That is a distinct shortcoming of the paper. But they are Astrophysicists. I take it they used tardigrades as the bellwether species.
 
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Well, everything that boils the oceans will also heat up the mantle. It just takes a bit longer, and I don't know how much it has to heat up to kill all the microbes there.
 
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Life is capable of surviving in some fairly extreme environments. Microbial life may be more resilient than tardigrades. See the table below from this review on microbial extremophiles:
https://academic.oup.com/femsre/article-lookup/doi/10.1093/femsre/fuw015

upload_2017-7-14_16-29-59.png
 
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1. How does life on Earth survive astrophysical events?

Life on Earth has proven to be remarkably resilient to astrophysical events such as supernovae, gamma ray bursts, and asteroid impacts. One reason for this is the planet's protective magnetic field, which deflects harmful radiation and particles. Additionally, the Earth's atmosphere provides another layer of protection from these events. Furthermore, life has adapted to extreme environments and can survive in conditions that would be lethal to most organisms.

2. Can life exist on other planets or moons in our solar system?

It is possible that life could exist on other planets or moons in our solar system. Scientists have discovered evidence of water on Mars and the potential for liquid oceans on Jupiter's moon, Europa. If these bodies have the necessary ingredients for life, such as liquid water and energy sources, it is possible that life could exist there. However, further exploration and research is needed to confirm the presence of life on these bodies.

3. How do astrophysical events impact the evolution of life?

Astrophysical events can have a significant impact on the evolution of life. For example, mass extinction events such as asteroid impacts have led to the demise of many species and allowed for the rise of new ones. Additionally, events like supernovae can provide the necessary elements for the formation of new planets and the building blocks of life. The constantly changing conditions in the universe also drive evolution and the development of new adaptations in organisms.

4. Could an astrophysical event cause the extinction of all life on Earth?

It is possible that an astrophysical event could cause the extinction of all life on Earth. However, the likelihood of this happening is low. The Earth has survived multiple mass extinction events in the past, and life has continued to thrive. Additionally, the Earth's position in the solar system and its protective features make it less vulnerable to certain types of astrophysical events compared to other planets.

5. How can studying the resilience of life to astrophysical events benefit humanity?

Studying the resilience of life to astrophysical events can provide valuable insights and knowledge that can benefit humanity. By understanding how life has adapted and survived in extreme conditions, scientists can apply this knowledge to developing technologies and strategies for human survival in hostile environments. Additionally, studying the history of astrophysical events and their impact on life can help us better prepare for potential future events and mitigate their effects on our planet.

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