Discover and read the best of Twitter Threads about #astrobiology

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@mikamckinnon @SiO2moyer @justinboldaji Carlsbad and Lechuguilla Caves have a really wierd and fascinating geology history. They were made by bacteria!
@mikamckinnon @SiO2moyer @justinboldaji The story goes like this. Gypsum laid down. Then...thick thick limestone laid down on top of that. Way way down deep, microbes eat gypsum, H2S bubbles up. (Microbes reduce sulfate). ((there might be other ways H2S bubbles up.)) That gets H2S percolating up into the limestone.
@mikamckinnon @SiO2moyer @justinboldaji Then, up higher in the limestone layers, there are places where oxygen in water mixes with H2S charged waters. Some bacteria love this! They can eat H2S in the water and combine with O2 in the water and get energy!!!
They pee out sulfuric acid! (H2SO4)
Read 15 tweets
Mimicking Simple Life Without Biochemistry

Follow this thread for insights from today's SFI Seminar by Juan Pérez-Mercader (SFI + @Harvard), which you can watch live on our FB page. Recording will be saved for later viewing at this link, as well as YT:…
More info about today's seminar by SFI External Professor Juan Pérez-Mercader (@Harvard) on Mimicking Simple Life Without Biochemistry:…

#astrobiology #biochemistry #complexity
What properties characterize life? The search for a fundamental theory of #biology continues to face some serious challenges:
• n = 1
• no unified math
• can't modify carbon experimentally
• biology is still process-description
BUT: ✨ info-metabolism-replication-evolution ✨
Read 10 tweets
Are viruses alive?
(Here is the thread y’all have been waiting for….)

Our survey says…..Yes! They are!

What do I think? Mmmmmm. No. they are not….well..sorta.
But no.

Digging into the big #science questions of #astrobiology
Definition of life is pretty fuzzy. Seems like its easy “yes or no” but IMHO it’s a big wonderfully complex beautiful spectrum. And by thinking about it, and how we would measure it, we can make better tests for detecting “life” on alien worlds, with alien biochemistries.
Here is a great link on “life” from NASA Astrobiology:…
Read 52 tweets
"Life did not invent #DNA."

Experimental support for the #hotsprings hypothesis for life's origin: David Deamer of @ucsc on nucleic acid polymerization in the wet-dry cycling of Darwin's "warm little pond," powered by #geothermal. Lab results confirmed in #hydrothermal pools.
From "boring statistical partitioning" in the fission of early protocells to the complex #homeostasis-driven #mitosis of the cells we know - Doron Lancet of @WeizmannInstSci on the gradient between closure of #autocatalysis #networks to complex regulatory mechanisms of #biology.
"Life is an integrated nested network of dynamic #kinetic cycles."

Addy Pross emphasizes the importance of motion to the persistent forms of self-organizing #complexsystems at SFI today
Read 13 tweets

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