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Andrew Planet's Discussions

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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¿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

Feeding astronauts in outer space and other worlds

Posted on May 29, 2013 at 3:37pm 0 Comments

I wrote the following on The Universe Today on their article on "NASA Looks at 3-D Food Printer for Star Trek-like Replicator''

Read more: http://www.universetoday.com/102328/nasa-looks-at-3-d-food-printer-for-star-trek-like-replicator/#ixzz2UiwisVAw

I think this is all a waste of money and very strange that normally…


Panspermia, the which came first, the chicken or the egg question?

Posted on February 28, 2013 at 9:00am 0 Comments

Below is a comment I wrote on


The problem with panspermia is that if life on Earth came from some other location in outer space, where did it come before that and so on with no end. Water, the universally…


Long term and lower cost space exploration

Posted on February 28, 2013 at 8:55am 0 Comments

This is a comment I made on the matter of long term space exploration, viable on 


Interplanetary and future deep space exploration entails engaging in technological…


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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

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The 5th Mexican School of Astrobiology

Posted by Tardigrelda on June 24, 2019 at 1:00pm 0 Comments

I am really glad to invite everyone to the next Mexican School of Astrobiology (aka EMA) which is this August.

¡Anímate a participar en la 5ta Escuela Mexicana de…


A consortium of representatives of European Research Organisations has taken the initiative to create a virtual institute named the “European Astrobiology Institute” (EAI) with the ambition of enabli…

Posted by Wolf D. Geppert on February 24, 2019 at 1:33am 0 Comments

A consortium of representatives of European Research Organisations has taken the initiative to create a virtual institute named the “European Astrobiology Institute” (EAI) with the ambition of enabling Europe to emerge as a key player in Astrobiology and to…


AbSciCon session on life in high salt habitats

Posted by Jeff Bowman on December 14, 2018 at 8:12am 0 Comments

Abstract submissions are open for AbSciCon 2019!  You can check out the full selection of sessions here, however, I'd like to draw your attention toward the session Salty Goodness: Understanding life, biosignature…


vemala Network

Posted by Apit Supriatna on October 7, 2018 at 1:07am 0 Comments

Vemala.com merupakan situs yang membahas seputar gaya hidup, dengan berbagai macam informasi kesehatan, olahraga, Fitness, review, kecantikan, relationship,Lifestile, Tips kehamilan,Fashion dan lain sebagainya.


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Ask your questions here!

Started by Gina Riggio in SAGANet Discussions. Last reply by Ian James Miller Jan 28. 83 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…Continue

Mentor Request

Started by Jerry Lee in SAGANet Community Jan 4. 0 Replies

Greetings all,             My name is Jerry Lee and I am in need of a mentor. I had the pleasure of meeting and exchanging e-mails with Dr. Svetlana Shkolyar and few years ago here when I was…Continue

Tags: Mentor

Internship in Astrobiology

Started by Eva Zanditenas in Jobs / Post-docs / Other opportunities Oct 9, 2019. 0 Replies

Hi, My name is Eva Zanditenas, I am in my final year of biotechnology (in Paris) and I looking for an internship of six months to conclude my studies.   I am passionate about astrobiology, and it is…Continue

Tags: internship

European Astrobilogy Institute now on Twitter !

Started by Wolf D. Geppert in SAGANet Community Sep 24, 2019. 0 Replies

ear All,The European Astrobiology Institute is now on Twitter : @EAIastrobiologyIf you are interested: Follow us!If you like a tweet: Like us!If you find a tweet interesting: Retweet!If you want us…Continue

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