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drrayeye Wrote:
-------------------------------------------------------
> Kristin,
>
> Knowing that there was life on earth as far back
> as we can go (3.4 billion years) and that at least
> one form of microorganism hasn't evolved in 2
> billion years seems to open up all sorts of
> possibilities to test--but that's as far as we can
> go.
>
> One possibility is that passing comets seeded and
> reseeded earth (primitive version), or that
> intelligent beings brought and/or nurtured
> (transformed) life from other origins numerous
> times (alien invaders version)--or, it just
> started up here (who knows when)
> spontaneously--perhaps multiple times.
>
> We are free to speculate. But until we go out and
> gather some evidence, we are no closer to
> establishing the reality of life in the
> universe--or even understanding the origin of
> life--than we ever were.
>
> Ray

Understood, and I agree. They had a hard enough time going back even that far--most of Earth's really old rocks have been subducted into the crust. In fact, to get an accurate age of the Earth, the poor grad student assigned to the project was reduced to getting his hands on meteorites.

3.465 billion years ago is stunningly early, and yet it's not the oldest life found. They found bacterial remains in Australia dating back 4.1 billion years.

That's almost all the way to the birth of the solar system.

If life arose that early on a molten lava Earth, it really can't be that hard for it to get going (or, alternately, it landed here from somewhere else). So IMO the authors aren't really going out on a limb to suggest that life may be common.

In the spring, at the end of the day, you should smell like earth. ~ Margaret Atwood



Edited 1 time(s). Last edit at 21-Dec-17 16:26 by Aine.

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Subject Views Written By Posted
Life in the universe probably common 2272 Aine 20-Dec-17 13:29
Re: Life in the universe probably common 436 Susan Doris 20-Dec-17 15:14
Re: Life in the universe probably common 395 D-Archer 20-Dec-17 16:17
Re: Life in the universe probably common 420 Aine 21-Dec-17 01:08
Re: Life in the universe probably common 454 D-Archer 21-Dec-17 10:54
Re: Life in the universe probably common 364 Archaic 27-Dec-17 03:43
Re: Life in the universe probably common 340 Eddie Larry 27-Dec-17 22:05
Re: Life in the universe probably common 333 Archaic 29-Dec-17 23:39
Re: Life in the universe probably common 355 Eddie Larry 30-Dec-17 05:30
Re: Life in the universe probably common 249 gulsbo 27-May-18 14:36
Re: Life in the universe probably common 214 D-Archer 28-May-18 10:30
Re: Life in the universe probably common 228 gulsbo 29-May-18 16:37
Re: Life in the universe probably common 209 D-Archer 29-May-18 17:32
Re: Life in the universe probably common 211 gulsbo 29-May-18 20:01
Re: Life in the universe probably common 211 D-Archer 30-May-18 09:43
Re: Life in the universe probably common 217 gulsbo 30-May-18 16:03
Re: Life in the universe probably common 217 gulsbo 30-May-18 16:28
Re: Life in the universe probably common 206 D-Archer 31-May-18 09:32
Re: Life in the universe probably common 217 gulsbo 11-Jun-18 06:07
Re: Life in the universe probably common 336 drrayeye 21-Dec-17 00:34
but Feynman's opinion is suspect after all...no? 359 Racho 21-Dec-17 00:49
Re: but Feynman's opinion is suspect after all...no? 375 Aine 21-Dec-17 01:07
Re: Life in the universe probably common 330 Aine 21-Dec-17 01:06
Re: Life in the universe probably common 325 drrayeye 21-Dec-17 14:06
Re: Life in the universe probably common 351 Aine 21-Dec-17 15:50
Re: Life in the universe probably common 322 D-Archer 21-Dec-17 16:06
Re: Life in the universe probably common 343 Aine 21-Dec-17 16:27
Re: Life in the universe probably common 416 D-Archer 21-Dec-17 18:54
Re: Life in the universe probably common 349 Aine 21-Dec-17 21:35
Re: Life in the universe probably common 313 D-Archer 22-Dec-17 08:51
Re: Life in the universe probably common 326 Aine 22-Dec-17 17:04
Re: Life in the universe probably common 324 D-Archer 23-Dec-17 11:11
Re: Life in the universe probably common 361 cladking 26-Dec-17 01:08
Re: Life in the universe probably common 288 Aine 26-Dec-17 17:34
Re: Life in the universe probably common 317 cladking 26-Dec-17 22:26
Re: Life in the universe probably common 202 jeffreyw 29-May-18 20:34
Re: Life in the universe probably common 218 gulsbo 30-May-18 19:29
Re: Life in the universe probably common 320 Susan Doris 21-Dec-17 16:10
Re: Life in the universe probably common 346 Aine 21-Dec-17 16:25
Re: Life in the universe probably common 322 Vanya 21-Dec-17 18:45
Re: Life in the universe probably common 324 D-Archer 21-Dec-17 16:03
Re: Life in the universe probably common 341 drrayeye 21-Dec-17 19:17
Re: Life in the universe probably common 371 D-Archer 22-Dec-17 08:56
Ingredients for Life Revealed in Meteorites That Fell to Earth 293 brett z 11-Jan-18 00:21
Re: Ingredients for Life Revealed in Meteorites That Fell to Earth 286 Aine 11-Jan-18 14:23
Re: Ingredients for Life Revealed in Meteorites That Fell to Earth 218 brett z 11-Jan-18 23:07
Blue sky thinking 278 drrayeye 11-Jan-18 18:29
Re: Blue sky thinking 262 Aine 11-Jan-18 18:55
Re: Blue sky thinking 278 drrayeye 11-Jan-18 19:24
Re: Blue sky thinking 287 Aine 11-Jan-18 19:36
Re: Blue sky thinking 289 drrayeye 11-Jan-18 22:05
Re: Blue sky thinking 287 carolb 11-Jan-18 21:14
Re: Blue sky thinking 308 brett z 11-Jan-18 23:04
Re: Blue sky thinking 319 drrayeye 11-Jan-18 23:44
Re: Blue sky thinking 281 brett z 11-Jan-18 23:55
Re: Blue sky thinking 260 drrayeye 12-Jan-18 03:19
I don't agree with your comparison 265 brett z 12-Jan-18 05:18
Maybe you misinterpreted 289 drrayeye 12-Jan-18 09:16
no, maybe you misinterpreted 286 brett z 13-Jan-18 23:24
Re: no, maybe you misinterpreted 258 Aine 14-Jan-18 00:18
Stuart Wolpert 244 drrayeye 14-Jan-18 08:10
Re: Stuart Wolpert 392 brett z 14-Jan-18 09:29
Re: Blue sky thinking 253 D-Archer 24-May-18 07:35
Life Paradigm 223 D-Archer 24-May-18 07:20
Re: Life Paradigm 260 gulsbo 26-May-18 19:02
Re: Life Paradigm 217 D-Archer 27-May-18 10:29
Re: Life in the universe probably common 241 gulsbo 26-May-18 17:38
Re: Life in the universe probably common 220 D-Archer 27-May-18 10:30
Re: Life in the universe probably common 219 gulsbo 30-May-18 19:31
Re: Life in the universe probably common 201 D-Archer 31-May-18 09:35
Re: Life in the universe probably common 306 gulsbo 31-May-18 17:47
Life Paradigm - synopsis 248 D-Archer 05-Jun-18 12:12
Re: Life Paradigm - synopsis 228 gulsbo 12-Jun-18 12:26
Re: Life Paradigm - synopsis 200 D-Archer 14-Jun-18 10:10
Re: Life Paradigm - synopsis 228 gulsbo 14-Jun-18 15:34
Re: Life Paradigm - synopsis 205 jeffreyw 14-Jun-18 17:47
Re: Life Paradigm - synopsis 409 D-Archer 15-Jun-18 12:05


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