The Mexican Meteor Network: A Preliminary Proposal

Cordero-Tercero, Guadalupe; Velázquez-Villegas, Fernando; Vazquez-Hernandez, Carlos; Ramírez-Cruz, José Luis; Arévalo-Vieyra, Alejandro; Mendoza-San-Agustín, Asahel; Camacho-Martínez, Fernando

doi:10.22201/igeof.00167169p.2016.55.1.1712

Cited by 3 publications

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References 23 publications

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“…Only local impactors are taken into account, the minimum impact velocity a small body has with the Earth is 11.2 km/s (Cordero-Tercero et al, 2016), capable of reaching down through the atmospheric shield and making an impact. Global planet sterilizing impactors are not considered here, although this rain of local small impactors may have given life tools to be better equipped against large global impactors.…”

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The 'disparitas conjecture' states that unicellular life is common in the galaxy but that multicellular life is rare in comparison. A variation of this conjecture is that unicellular life may be common in the galaxy but that intelligent life is rare. However, microbial life can and does indeed display characteristics of intelligence. Thus, in this work, how life could have potentially endured through the Late Heavy Bombardment (LHB) through intelligent strategies such as decision-making, association and anticipation, communication and self-awareness was investigated. At the LHB, there would have been, for microbial life, an unpredictable environmental fluctuation regarding pools of amino acids, lipids and fluids available when impacts and reimpacts launched organisms into new habitats. Thus, evolutionary strategies must have been favoured that could stretch the available external and internal resources as long and as efficiently as possible. Thus, inclusive fitness or kin altruism could have emerged, where organisms adapt to acquire energy and nutrients from siblings who voluntarily autolysed to replenish the amino acid pool for their kin. A further strategy could also evolve where members of the same species can recognize each other and actively isolate themselves from other species, which allows them to better utilize the amino acid pool. Thus, the organisms will potentially be able to survive for a long time in this manner until new impacts launch them to new spots with amino acid pools. There has thus been an alternating increase and decrease in the number of organisms during this localized planetary reseeding, and life may have endured this way until the bombardments were over. Thus, if a world inhabited only by analogous bacteria, archaea and protists is located elsewhere in the galaxy, the existence of intelligent life there cannot be excluded.

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Astrobiology and Planetary Sciences in Mexico

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Cordero-Tercero

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et al. 2020

Cuatro Ciénegas Basin: An Endangered Hyperdiverse Oasis

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A potential survival strategy during the late heavy bombardment

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The Late Heavy Bombardment (LHB) represents a period of time in which an increased number of impactors collided with the Earth. While there were continuous collisions of impactors globally, these would be perceived by populations of life as locally infrequent, as they occurred at different times and locations across the planet. These impactions presented a severe and unpredictable environmental pressure on life, as they could at any moment destroy organisms and their local habitats. However, such an environment could potentially lead to the selection of a particular evolutionary strategy, bet hedging, which is an adaptation to unpredictability itself. Thus, a model for analysing this has been put forward in the form of a system of rings arising from an impact-consisting of the inner primary and outer secondary rings, which demonstrates the dynamic interplay between the external pressure from impact dynamics and life's evolutionary response towards it. The model demonstrates that there is a longer relaxed period where organisms thrive and a short violent period where they must survive three violent events and respond to a potentially different environment. This evolutionary strategy consistently results in a higher number of surviving organisms compared to other evolutionary strategies; thus, it may have played a crucial role in life's endurance through the LHB-an insight relevant to astrobiology.

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The Mexican Meteor Network: A Preliminary Proposal

Cited by 3 publications

References 23 publications

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Astrobiology and Planetary Sciences in Mexico

A potential survival strategy during the late heavy bombardment

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