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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

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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 438 Susan Doris 20-Dec-17 15:14
Re: Life in the universe probably common 396 D-Archer 20-Dec-17 16:17
Re: Life in the universe probably common 422 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 365 Archaic 27-Dec-17 03:43
Re: Life in the universe probably common 341 Eddie Larry 27-Dec-17 22:05
Re: Life in the universe probably common 334 Archaic 29-Dec-17 23:39
Re: Life in the universe probably common 358 Eddie Larry 30-Dec-17 05:30
Re: Life in the universe probably common 250 gulsbo 27-May-18 14:36
Re: Life in the universe probably common 215 D-Archer 28-May-18 10:30
Re: Life in the universe probably common 229 gulsbo 29-May-18 16:37
Re: Life in the universe probably common 210 D-Archer 29-May-18 17:32
Re: Life in the universe probably common 212 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 218 gulsbo 30-May-18 16:03
Re: Life in the universe probably common 219 gulsbo 30-May-18 16:28
Re: Life in the universe probably common 207 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 337 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? 376 Aine 21-Dec-17 01:07
Re: Life in the universe probably common 331 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 353 Aine 21-Dec-17 15:50
Re: Life in the universe probably common 323 D-Archer 21-Dec-17 16:06
Re: Life in the universe probably common 345 Aine 21-Dec-17 16:27
Re: Life in the universe probably common 418 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 314 D-Archer 22-Dec-17 08:51
Re: Life in the universe probably common 328 Aine 22-Dec-17 17:04
Re: Life in the universe probably common 325 D-Archer 23-Dec-17 11:11
Re: Life in the universe probably common 362 cladking 26-Dec-17 01:08
Re: Life in the universe probably common 289 Aine 26-Dec-17 17:34
Re: Life in the universe probably common 318 cladking 26-Dec-17 22:26
Re: Life in the universe probably common 203 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 323 Vanya 21-Dec-17 18:45
Re: Life in the universe probably common 325 D-Archer 21-Dec-17 16:03
Re: Life in the universe probably common 342 drrayeye 21-Dec-17 19:17
Re: Life in the universe probably common 374 D-Archer 22-Dec-17 08:56
Ingredients for Life Revealed in Meteorites That Fell to Earth 296 brett z 11-Jan-18 00:21
Re: Ingredients for Life Revealed in Meteorites That Fell to Earth 287 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 280 drrayeye 11-Jan-18 18:29
Re: Blue sky thinking 262 Aine 11-Jan-18 18:55
Re: Blue sky thinking 279 drrayeye 11-Jan-18 19:24
Re: Blue sky thinking 287 Aine 11-Jan-18 19:36
Re: Blue sky thinking 292 drrayeye 11-Jan-18 22:05
Re: Blue sky thinking 288 carolb 11-Jan-18 21:14
Re: Blue sky thinking 311 brett z 11-Jan-18 23:04
Re: Blue sky thinking 320 drrayeye 11-Jan-18 23:44
Re: Blue sky thinking 282 brett z 11-Jan-18 23:55
Re: Blue sky thinking 261 drrayeye 12-Jan-18 03:19
I don't agree with your comparison 266 brett z 12-Jan-18 05:18
Maybe you misinterpreted 289 drrayeye 12-Jan-18 09:16
no, maybe you misinterpreted 289 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 393 brett z 14-Jan-18 09:29
Re: Blue sky thinking 254 D-Archer 24-May-18 07:35
Life Paradigm 225 D-Archer 24-May-18 07:20
Re: Life Paradigm 262 gulsbo 26-May-18 19:02
Re: Life Paradigm 218 D-Archer 27-May-18 10:29
Re: Life in the universe probably common 242 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 220 gulsbo 30-May-18 19:31
Re: Life in the universe probably common 202 D-Archer 31-May-18 09:35
Re: Life in the universe probably common 308 gulsbo 31-May-18 17:47
Life Paradigm - synopsis 249 D-Archer 05-Jun-18 12:12
Re: Life Paradigm - synopsis 229 gulsbo 12-Jun-18 12:26
Re: Life Paradigm - synopsis 200 D-Archer 14-Jun-18 10:10
Re: Life Paradigm - synopsis 229 gulsbo 14-Jun-18 15:34
Re: Life Paradigm - synopsis 205 jeffreyw 14-Jun-18 17:47
Re: Life Paradigm - synopsis 410 D-Archer 15-Jun-18 12:05


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