Andrew Planet
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AbSciCon 2015 recorded videos event

Started this discussion. Last reply by Jamie Rich Jul 22, 2015. 3 Replies

This is a week long event that happened recently called AbSciCon 2015 and which NASA Astrobiology recorded.  The different speakers covered an immense variety of topics inclusive within the realm of…Continue

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Welcome, Andrew Planet!

Profile Information

What best describes you?
Educator, Science enthusiast
Main Affiliation
Human Ecology
About Me (we also use this to ensure that you are a real person - if left blank, you will not be registered)
I´m into human ecology with a factualist belief system & psychoneural identity. I exist therefore I am. I think therefore I virtually verbalize mentally. Thinking life in this universe is this same universe aware of itself and so human ecology encompasses from the furthest reaches humans have astronomically been able to discern, to management of this very Earth from where we started to look beyond geocentric perception.

I'm culturally British based but I'm fluently bilingual with Spanish, with an Andalucian accent. I've only been educated in English though. Being anglicized is a very Spanish thing to do. Due to my biligualism and writing primarily in English on a Spanish hardware keyboard, I accidentally created this emoticon yesterday :¡D (04/05/20)

On my profile photo you can see me with the North African continental coastline at the top throughout most of the photo in a line, across the entrance to the Mediterranean Sea behind me whilst standing in Gibraltar's nature reserve, Southernmost Iberia, Europe.

This photo is coincidentally very appropriate because my right eye, the one I'm visually impaired with, on the left, is in the shade and my other normal sighted eye is in the sunlight on the right.

Me interesa ecologia humana planetaria y tengo un sistema de creencias basado es echos. Existo, luego pienso. Pienso, es decir, verbalizo virtualmente en mi mente. Soy bilingue con el ingles

To see some of my writing go to




¿Did ribosomes evolve in a lower order type of prokaryote endosymbiosis?

Last nights (my time) live video session with Bruce Damer was very thought stimulating and he mentioned ribosomes which I am fond of but only know about per se at a very basic level

After the video session a tweet (below) on fossil DNA came out to replace the video window and even though this was not directly related to ribosomes, the slide on the cyanobacteria reminded me of the ticker tape mechanism of ribosomes reading mRNA. ¿The thought came to me then, did ribosomes evolve in a lower order type of prokaryote endosymbiosis?

There are different levels of symbiosis, the most ancestrally basic known as mitochondria and chloroplasts in eukaryotes which are thought to have evolved from erstwhile prokaryotes, There is also symbiosis of a higher order such of eukaryotes on eukaryotes such as the photosynthetic green sea slug Elysia cholorotica which uses algae to photosynthesize is a process called kleptoplasty and another one is lichens which are formed from the symbiotic relationships between fungi and algae. One last example is that of the photosynthetic marine flatworm Symsagittifera roscoffensis,

Coming back to ribosomes, they are minute particles consisting of RNA and associated proteins, found in large numbers in the cytoplasm of living cells and which bind messenger RNA and transfer RNA to synthesize polypeptides and proteins. I mentioned my idea on whether ribosomes in organisms could have evolved as the result of some sort of endosymbiosis to a Saganet member that had remained online after the video. He answered that there was such a thing as ribozymes which are RNA molecules capable of acting as an enzyme. So I concluded that if an organism evolved to incorporate another organism that replicated using ribozymes using ribozymes itself to replicate too, endosymbiosis might have been possible, leading to the evolution of ribosomes.  Satellite viruses (See link below) might be doing something like the latter

Literally a few minutes after that event a post which I coincidentally came about was made on Natalie Cabrols Facebook page called Planetary Landscapes on the green sea slug Elysia cholorotica. I’d messaged Planetary Landscapes through Facebook on Elysia cholorotica last January to see if they knew about it and might want it to make a post but on that occasion they did not reply. I was so glad to see the post that I repeated on it all the ideas that had just occurred to me on Saganet which I’d also contributed to the Tweet I mentioned above.

Like I mentioned before, I only know about ribosomes per se in very basic terms but it seems to have been a plausible theory of endosymbiosis in prokaryotes.

I have in fact taught on Elysia cholorotica in Powerpoint presentations I have given on plants to classes of children. I have also given classes in English and Spanish to children on cosmological evolution and how that leads to biological evolution. I’ve done that in state schools and private educational concerns in Gibraltar and Spain. At the end of the classes we ask the children to draw a picture or write some text, or both, on their take on evolution and we give them actual polished fossils as prizes to the best four or five. I import Moroccan fossils from England because even if Morocco is just a few kilometers away from Gibraltar, it costs 4 times less to do so. ¡Bless Darwin!


Satellite Viruses   https://en.wikipedia.org/wiki/Satellite_(biology)

Andrew Planet's Blog

Defining Lyfe in the Universe: From Three Privileged Functions to Four Pillars

Posted on January 30, 2021 at 4:18pm 0 Comments


Motivated by the need to paint a more general picture of what life is—and could be—with respect to the rest of the phenomena of the universe, we propose a new vocabulary for astrobiological research. Lyfe is defined as any system that fulfills all four processes of the living state, namely: dissipation, autocatalysis, homeostasis, and learning. Life is defined as the instance of lyfe…

Using tried and tested methods of constructing habitats from ethnobotanical and ethnozoological useful species for self sustainability on Mars

Posted on June 26, 2020 at 8:00am 0 Comments

To maximize crop yields on Mars it would be advantageous to do away with annuals and biannuals by engineering the latter into perennials as standard. Not only would that entail far less work to grow produce as the act of replanting is made obsolete, but per given cultivated area perennials bring forth more food and materials with less demand from the soil than the equivalent of annuals.

Imagine a superfood annual such as lentils engineered into a lentil tree for which there already…


Radiolysis-powered life

Posted on June 11, 2020 at 9:56pm 7 Comments

This paper greatly extends the possibility of what a Goldilocks zone can be.  Its no longer the Goldilocks zone as a single expanse, its the Goldilocks zones for a particular area


¿Are the Venusian sulphuric acid clouds the by product of long dead anoxogenic photosynthetic organisms?

Posted on May 4, 2020 at 2:51pm 2 Comments

I just read the piece at the link below entitled "Study: Life might survive, and thrive, in a hydrogen world."

I'd been thinking on similar lines recently, on different atmospheres with early life, but I was considering anoxogenic bacteria whose byproduct is sulfur instead of molecular oxygen. ¿Had life evolved on Venus could its sulfuric clouds be the signature byproduct of such life with no branches ever evolving to produce the equivalent of Earth's Great…


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At 11:18am on September 21, 2020, David Renshaw said…

Hi Andrew,

RE: Venus; possible life in upper atmosphere.

If this is confirmed, it seems to me that panspermia becomes a possibility.  Yes, I know the idea has drastically fallen from favor recently.  However, if true, incoming spores would find themselves at a viable temperature (at ~ 40km altitude).  If they were small enough, they be propeeled by the winds & wouldn't have much risk of falling to a dangerous altitiuded.  Their main problem would be surviving at what we'd count as a very hostile pH - though having regard for certain extremophiles that we've discovered on Earth, this might still be feasible.

The alternative would be that the living material evolved in ancient times on a much more hospitable Venusian surface, but then migrated to high altitudes after failing to endure progressively hotter conditions (eventually ~480C). This seems less plausible.

Regards,  David Renshaw

At 1:24pm on May 28, 2013,
Sanjoy Som

Hey Andrew! To stimulate the "Sagan en habla hispana" group, would you be able to translate and post each week the discussion of the week inside the group's discussion forum? What do you think? - cheers



Ask your questions here!

Started by Gina Misra in SAGANet Discussions. Last reply by Peter Rasenberg Sep 1. 198 Replies

If you are trying to ask a question live during Ask an Astrobiologist, please do so in the main chatroom at the bottom of the screen! You can also ask on twitter @saganorg…Continue

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