Earth may have been seeding Venus with life for billions of years
In short: Could the microbes in Venus's dense clouds be terrestrial hitchhikers? New research suggests that asteroid impacts could blast Earth-based life into space, where it might survive a brutal journey to settle in the atmosphere of our neighboring planet.
The theory of panspermia posits that life or its building blocks can travel between worlds via asteroids and comets. While scientists have long debated interplanetary transfers between Earth and Mars, recent interest in potential microbial life within Venus's thick clouds has expanded this scope to include the planet as a possible destination for terrestrial seeds. This possibility has gained traction due to a recent controversy regarding microbial life in Venusian clouds. Researchers are now specifically looking at the potential for interplanetary transfers between Earth, Mars, and Venus.
By employing the 'Venus Life Equation' (VLE), scientists at Sandia National Laboratories and The Johns Hopkins University Applied Physics Laboratory (JHUAPL) investigated this concept. Developed by Noam Izenberg and his team in 2021, the VLE functions similarly to the Drake Equation, calculating the likelihood of extant life (L) by multiplying three factors: Origination (O), Robustness (R), and Continuity (C). According to their simulations, organisms transported from Earth might endure within Venusian clouds for a minimum of several days every hundred years. The VLE framework provides an estimate of likelihood ranging from 0 to 1. In this scale, 0 represents no chance while 1 signifies certainty. This mathematical model helps quantify how many factors must align for life to persist.
For these 'hitchhikers' to succeed, they must endure extreme trauma. Material ejected by impacts faces violent shock, intense heat, radiation, the vacuum of space, and massive temperature swings. However, computer simulations and studies of meteorites recovered on Earth indicate that organic material can indeed survive both ejection and interplanetary travel. The final hurdle is atmospheric: once reaching Venus, the material must remain suspended within or above the cloud layers to persist. For these organisms to survive on the planet, they cannot simply land on the surface. They must specifically remain suspended in the atmosphere. The study confirms that organic matter can withstand both the initial impact and the subsequent trip through space.
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- Summary by Intellect · source: Exciting Updates About Venus and Its Atmosphere: Could Life Have Come From Earth?
- Also: If life exists in Venus's atmosphere, it could have come from Earth
- Also: Earth may have been seeding Venus with life for billions of years
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