Return to the Cloudy Nights Telescope Reviews home pageAstronomics discounts for Cloudy Nights members
· Get a Cloudy Nights T-Shirt · Submit a Review / Article

Click here if you are having trouble logging into the forums

Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu… uh, User

Speciality Forums >> Science! Astronomy & Space Exploration, and Others

Pages: 1 | 2 | (show all)
llanitedave
Humble Megalomaniac
*****

Reged: 09/26/05

Loc: Amargosa Valley, NV, USA
Re: Did meteorites bring life from Mars? new [Re: GregLee1]
      #6056827 - 08/31/13 10:37 PM

I don't think scientists studying the origin of life are motivated to cater to yours or anyone else's psychological needs. It's not public relations, except on the part of the press doing the lay translation. It's serious work, conjecture and refutation in the Popperian sense.

While I provisionally disagree with the proposals put forward by Steven Benner and his team, not for one moment do I believe he's pulling a PR stunt. He's going where his own research interests and evidence lead him. I think he's wrong, but if he turns out to be right, then the evidence will accumulate in his favor.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Ira
Carpal Tunnel
*****

Reged: 08/22/10

Loc: Mitzpe Ramon, Israel
Re: Did meteorites bring life from Mars? new [Re: llanitedave]
      #6057381 - 09/01/13 10:37 AM

Understanding the origins of life is a parallel endeavor to understanding the origins of the universe -cosmology - one of the nobelest endeavors of science.

/Ira


Post Extras: Print Post   Remind Me!   Notify Moderator  
Glassthrower
Vendor - Galactic Stone & Ironworks
*****

Reged: 04/07/05

Loc: Oort Cloud 9
Re: Did meteorites bring life from Mars? new [Re: Ira]
      #6057454 - 09/01/13 11:18 AM

I don't care if an old man in the sky dreamed us up, or if we evolved from a mud puddle on Neptune. The origins of life do interest me. But, I'll leave the wild conjecture up to the media. Media (online or otherwise) is about selling advertisements and writers will resort to hyperbole to generate interest or clicks. Some venues have a little more integrity than others, but all of them do it. It's science packaged for mass consumption and entertainment purposes.

Personally, it tends to aggravate me when the media distorts anything about meteorites, because it generates a lot of misinformation and headaches for those of us who work with meteorites on a daily basis.

Every time one of these articles comes out, I get a spike in unsolicited emails from scammers sending me blurry photos of misrepresented earth rocks, and hopeful newbies thinking their grandpa's prized river rock is a Martian meteorite worth a king's ransom.

Actually, I shouldn't complain too much. Every time one of these wild Martian stories hit the press wires, I get more visitors interested in learning about them and possibly buying them.

Quote:


Even if you take the "Mars First" hypothesis as credible, it's necessary that Earth's environments had already done nearly all the preparatory work for triggering the emergence of life. I don't think anyone has enough knowledge to assert that in spite of all the environmental, chemical, thermal, mineralogical, and textural diversity of early Earth, it lacked simply one single keystone that had to come from Mars -- about which we know even less.





Good points Dave and I see what you were saying. For this theory to hold any water, it assumes the entire puzzle was already put together here on Earth, save that one goofy piece from Mars. Yeah, I don't see that either.

Best regards,

MikeG


Post Extras: Print Post   Remind Me!   Notify Moderator  
llanitedave
Humble Megalomaniac
*****

Reged: 09/26/05

Loc: Amargosa Valley, NV, USA
Re: Did meteorites bring life from Mars? new [Re: Glassthrower]
      #6057523 - 09/01/13 11:49 AM

There is one upside to the recent hypothesis. If it turns out that Mars was indeed capable of producing RNA (and that still does not in any way indicate that Earth was not), chances are it was capable of producing the other necessary organics as well, and it implies that life could have originated independently on both bodies. That's certainly something worth looking for.

If it did, and if there are traces still to be found, I'd be very interested to see what the genetic differences between Mars life and Earth life would have been. Did DNA appear subsequent to RNA on Mars as well? Do codons have the same patterns and the same bases on both planets? Did the C-G-A-T/U pattern exist on Mars as well as Earth? These questions are ultimately far more exciting to me, and have broader implications about what we can expect life to consist of and how it's likely to form elsewhere.


Post Extras: Print Post   Remind Me!   Notify Moderator  
GregLee1
professor emeritus


Reged: 07/21/13

Loc: Waimanalo, HI
Re: Did meteorites bring life from Mars? new [Re: Ira]
      #6057606 - 09/01/13 12:38 PM

Quote:

Understanding the origins of life is a parallel endeavor to understanding the origins of the universe -cosmology - one of the nobelest endeavors of science.



Yes, and if we can ever get our hands on truly extraterrestrial life to study, that will be a huge step for us. However, finding that one particular component of terrestrial life, long ago, came from Mars just seems a bit ho-hum. It would be like me discovering that my grandfather, who I had thought was born in Kentucky, was actually an immigrant from Germany. Sort of interesting, for me anyway, but not something that changes the world.


Post Extras: Print Post   Remind Me!   Notify Moderator  
choran
Pooh-Bah
*****

Reged: 12/28/12

Re: Did meteorites bring life from Mars? new [Re: GregLee1]
      #6111708 - 10/01/13 06:36 PM

I'm pretty much with Greg on this one. See, I'd still point to the Old Man, but just understand he got around a bit more than I thought. LOL

Post Extras: Print Post   Remind Me!   Notify Moderator  
UND_astrophysics
sage


Reged: 01/19/13

Re: Did meteorites bring life from Mars? new [Re: llanitedave]
      #6114440 - 10/03/13 12:57 AM

Quote:

Quote:

The idea here is not that Martian meteorites contained some sort of biological spores or living material that brought life here.

Instead, Martian meteorites contained key chemical ingredients that allowed the formation of RNA, a critical stepping-stone on the way to the evolution of life. At the time, Earth lacked the right conditions and ingredients to form RNA, and it is theorized that the source of the missing ingredients could be Martian meteorites.

It is a tantalizing theory not without merit. But, the evidence is far from conclusive.

It's entirely possible though. We may have a simple shower of Mars rocks to thank for our existence.

Best regards,

MikeG




I'm not sure what merit it has. I've not seen any evidence that early Earth had any particular inability to support the synthesis of RNA, or that early Mars had any special ability to. If anything, early earth should have had access to pretty much any environmental condition that early Mars would have, plus others as well.

All we have on either side of that particular issue, so far as I know, are speculations. I'm pretty dubious about anyone who thinks he can turn those into assertions.




You are exactly right. There is no reason to believe the odds of a meteor bringing life to Earth is more probable than RNA world hypothesis in action here. Everything was in place, and for those who are not aware of RNA world and the interaction between silicate clays, water, and self reproducing molecules, I suggest you research it for yourself. Since Earth was formed by the accretion of dust and gas during Sol system's formation, where is the line drawn in regards to panspermia? After the late bombardment? After the Great oxygenation event? There have been several mass extinctions, yet all life uses the same genetic code, with the same chirality in amino acids, I would love to delve into the topic of why it is more reasonable to assume that RNA world has more validity, but some people do not want to accept it, so I will not waste time. I can say I am glad someone rationally commented , and I am glad somebody gets it.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1 | 2 | (show all)


Extra information
0 registered and 4 anonymous users are browsing this forum.

Moderator:  LivingNDixie, FirstSight, JayinUT 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled


Thread views: 600

Jump to

CN Forums Home


Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics