The Deep Biospheres | Summary and Q&A

TL;DR

Life exists below the Earth's surface, in a segment known as the Deep Biosphere, which has implications for the habitability of exoplanets.

Key Insights

• 🥹 The Deep Biosphere extends below Earth's surface and holds as much biodiversity as the surface.
• ❓ Microbes like archaea can survive in extreme temperatures, with potential implications for exoplanet habitability.
• 🐢 The energy sources and metabolism of the Deep Biosphere differ from surface life, with slower microbial activity.
• 🖐️ Viruses may play a crucial role in deep biospheres, promoting cell turnover and aiding evolutionary processes.
• 🎑 Lake Vostok in Antarctica provides a unique environment similar to an ice shell moon and offers insights into ancient life and paleoclimatic records.
• 🙂 Studying deep biospheres can shed light on the habitability of exoplanets.
• 💦 The Deep Biosphere challenges the concept of habitable zones based solely on surface water, expanding the possibilities for subsurface life on exoplanets.
• 👶 Drilling into Lake Vostok poses challenges, but it provides a valuable opportunity to study a deep biosphere environment and potentially discover new forms of life.

Transcript

When we think of a habitable world, we tend to think of surface life, biased that we are because we are surface life. But the reality is that there’s as much going on below the surface of the earth than there is at the surface with a comparable biodiversity and many unanswered questions and may hold implications on the habitability of exoplanets. K... Read More

Questions & Answers

Q: What is the Deep Biosphere, and how does it differ from surface life?

The Deep Biosphere is a segment below Earth's surface, extending down to at least 5 kilometers deep. It differs from surface life in terms of available energy sources, metabolism, and slower microbial activity.

Q: Can life survive in extreme temperatures?

Yes, Strain 121, a hyperthermophile microbe, can reproduce in water at temperatures of 250 degrees Fahrenheit. However, the upper limit for known biology is still being explored.

Q: How do viruses contribute to the deep biosphere?

Viruses promote cell turnover and transfer genetic information between cells. They may be necessary for the evolutionary process and could explain the rarity of complex alien life.

Q: What potential candidates exist for deep biospheres beyond Earth?

Mars, ice shell moons such as Europa and Enceladus, Io's lava tubes, and even the moon itself could potentially host deep biospheres. Research has shown the presence of subsurface oceans in ice shell moons.

Summary & Key Takeaways

• The Deep Biosphere is a segment of Earth's biosphere that extends below the surface, with as much biodiversity as the surface and comparable unanswered questions.

• Microbes called archaea, such as Strain 121, can survive in extreme temperatures, but further research is needed to understand the upper limit for biology.

• The Deep Biosphere differs from surface life in terms of energy sources and metabolism, and it supports a wide range of microorganisms with slow metabolism and potentially long lifespans.