Search FQXi


If you have an idea for a blog post or a new forum thread, then please contact us at forums@fqxi.org, with a summary of the topic and its source (e.g., an academic paper, conference talk, external blog post or news item).
Forum Home
Introduction
Terms of Use

Order posts by:
 chronological order
 most recent first

Posts by the blogger are highlighted in orange; posts by FQXi Members are highlighted in blue.

By using the FQXi Forum, you acknowledge reading and agree to abide by the Terms of Use

 RSS feed | RSS help
RECENT FORUM POSTS

James Dunn: "Rudiment considerations. Mathematics is fundamentally based upon..." in Is the universe infinite...

Leonard Malinowski: "Alice, what do you think of the following? String Theory and subquantum..." in Is the Past Infinite?

Georgina Parry: "Configuration to configuration and iteration to iteration are both ways of..." in Time and the Nature of...

Georgina Parry: " Building unimaginable shapes A really fascinating TED talk. With an..." in Time and the Nature of...

Nick Mann: "It can be useful, though. For instance, Beavis & Butt-Head's Ensucklopedia..." in Classical Spheres,...

John Cox: "Nick' "One exception is the square root of a negative number." aahhh, yes..." in Classical Spheres,...

I AM EPIONTIC: "Dear Zurek, Who am I? I "is" the epistemic and "am" the ontic aspects..." in Reality's NeverEnding...

Pentcho Valev: "Einsteinians : Children of the Universe Sabine Hossenfelder: "Most people..." in Ripping Apart Einstein


RECENT ARTICLES
click titles to read articles

Reality's NeverEnding Story
A quantum version of Darwinian natural selection could enable the universe to write itself into being.

The Quantum Dictionary
Mark Van Raamsdonk is re-writing how we define the shape of our universe. Can such translations help to unite quantum theory and gravity?

Q&A with Paul Davies: What is Time?
Where does time come from? Why does it seem to flow?

Quantum Computers Get Real
Fighting decoherence to scale up quantum technologies.

Q&A with David Rideout: Testing Reality in Space
Satellite experiments could soon investigate the boundaries of quantum physics and relativity.


FQXi BLOGS
April 20, 2014

CATEGORY: Blog [back]
TOPIC: Impact [refresh]
Bookmark and Share

Blogger William Orem wrote on Dec. 11, 2008 @ 22:38 GMT


Remember my radical idea from last August? This was the suggestion that microbial life might be lying dormant in the centers of some craters on the moon, having been transferred there, panspermia-style, via impactors originating elsewhere in the Solar System (or beyond). Perhaps Copernicus crater is right now home to a colony of alien bacteria, and the first samples of extraterrestrial...

view entire post


this post has been edited by the author since its original submission

report post as inappropriate


Count Iblis wrote on Dec. 12, 2008 @ 17:11 GMT
Some scientists have proposed that complex molecules may have evolved inside comets and then delivered to Earth via glancing impacts or just via the comets shedding dust that than make it to Earth.

The very cold conditions inside comets make them ideal places to cook up complex molecules. In a test tube, the chemical reactions will produce the most stable compounds. You cannot make complex moleculs of which the intermedary products would be very unstable.

Inside a comet a molecule can react with another molecule in its immediate vicinity, without being bothered by oter molecules that are further away. This allows the formation of large molecules which will in general be very unstable at room temperatures. But some of these unstable molecules may then combine to form more stable molecules.

If the comet is kicked out of the Oort cloud and ends up in an elliptical orbit bringing it close to the Sun for short periods, then during the brief warm periods inside the comets, the unstable complex molecules will be destroyed, the more stable molecules may be able to survive. What may also happen is that different unstable molecules that are nstable on a time scale of a few hours may combine to form a molecule that is stable on a time scale of months. These more stable molecules will then be able to survive the brief warm period

Then, the comet moves away from the Sun, and reactions will be limited to close neighbors again. Cosmic rays may cause muations at greater disctances from the Sun. Molecules can then form unstable combinations with impunity again until the next warm period arrives.

report post as inappropriate


Blogger William Orem wrote on Dec. 22, 2008 @ 21:20 GMT
Count –

By your command.

I had a conversation with Max Wallis at the Cardiff Centre for Astrobiology in Wales a few years back during which he made a compelling case for exactly this possibility. Asteroids, as he said, “are pretty dead,” whereas

“I think comets can form an environment in their interior in which elementary life can replicate, survive and travel in a sheltered environment to another stellar system.”

That’s a quotation that appears in the article I was writing at the time, “What If Life On Earth Did Not Begin On Earth?” which is now online at Red Ice, if you are interested.

This Discover article is also fun. “Intersetellar clouds of gas are impregnated with organic molecules . . .”

William

report post as inappropriate


Count Iblis wrote on Jan. 2, 2009 @ 22:53 GMT
William, thanks for the links to these interesting articles!

report post as inappropriate



Please enter your e-mail address:
Note: Joining the FQXi mailing list does not give you a login account or constitute membership in the organization.