Space theorist posits unusual life on Mars: San Francisco Chronicle

Ivan Seeking

Staff Emeritus
Science Advisor
Gold Member
7,093
174
16
1
I was a little surprised by the last sentence in this article: "This would show us immediately that genesis is easy everywhere".

To me this seems like a stretch. As far as I understand it, life, especially complex life, is probably rare in the universe – possibly exceedingly so. Its presence is apparently constrained by, among other things, the need for ample chemical materials of the right kind to be present; available water; a suitable substrate; a planetary mass sufficient to retain an atmosphere of moderate depth; an acceptable sun to planet distance to maintain an acceptable climate; a stable, relatively circular planetary orbit; a sun of moderate mass to generate a steady source of radiant energy with a spectral distribution that peaks in the visual range and a sufficient timeline for requisite physical and evolutionary process to occur.

Plus, it may be telling that in all the years since the Very Large Array (VLA) of radio-monitors has been listening for civilization-signature radio waves across the heavens we still haven't picked up anything (at least as far as the general population knows).
 

FZ+

1,550
2
I spy a little problem... How far is it from "unusual life" to "life" so unusual we don't consider it life at all?
 

Related Threads for: Space theorist posits unusual life on Mars: San Francisco Chronicle

  • Posted
Replies
3
Views
2K
  • Posted
Replies
5
Views
2K
  • Posted
Replies
9
Views
3K
  • Posted
Replies
9
Views
4K
  • Posted
Replies
7
Views
919
  • Posted
Replies
4
Views
3K
  • Posted
Replies
3
Views
3K

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving

Hot Threads

Top