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Carl Sagan's criticisms of Worlds in Collision



Worlds in Collision, the subject of Carl Sagan's criticisms


Scientists Confront Velikovsky, in which Carl Sagan's AAAS paper first appeared.


Broca's Brain also includes a version of Carl Sagan's AAAS paper.
Astronomer Carl Sagan criticized the ideas in Immanuel Velikovsky's book, Worlds in Collision, presenting them as "Ten Problems" in:

1974 AAAS conference, Velikovsky's Challenge to Science as "An Analysis of 'Worlds in Collision'"
1977 conference proceedings, Scientists Confront Velikovsky as "An Analysis of 'Worlds in Collision'"
1979 Carl Sagan's own book, Broca's Brain as "Venus and Dr. Velikovsky"

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Subject Views Written By Posted
More comet evidence in support of Velikovsky 1957 Laird Scranton 28-Oct-15 23:02
Re: More comet evidence in support of Velikovsky 441 OCaptain 28-Oct-15 23:09
Re: More comet evidence in support of Velikovsky 307 carolb 28-Oct-15 23:12
Re: More comet evidence in support of Velikovsky 427 Laird Scranton 28-Oct-15 23:51
Re: More comet evidence in support of Velikovsky 304 Laird Scranton 28-Oct-15 23:42
Re: More comet evidence in support of Velikovsky 295 carolb 28-Oct-15 23:49
Re: More comet evidence in support of Velikovsky 275 Laird Scranton 29-Oct-15 00:42
Re: More comet evidence in support of Velikovsky 342 laughin 29-Oct-15 16:29
Re: More comet evidence in support of Velikovsky 337 Starbinder 29-Oct-15 17:42
Re: More comet evidence in support of Velikovsky 281 OCaptain 29-Oct-15 18:08
Re: More comet evidence in support of Velikovsky 244 laughin 29-Oct-15 18:49
Re: More comet evidence in support of Velikovsky 262 OCaptain 29-Oct-15 23:13
Re: More comet evidence in support of Velikovsky 267 laughin 31-Oct-15 15:26
Re: More comet evidence in support of Velikovsky 302 drrayeye 31-Oct-15 16:49
Re: More comet evidence in support of Velikovsky 224 OCaptain 31-Oct-15 16:58
Re: More comet evidence in support of Velikovsky 239 laughin 31-Oct-15 18:24
Re: More comet evidence in support of Velikovsky 235 OCaptain 31-Oct-15 19:07
Re: More comet evidence in support of Velikovsky 253 laughin 01-Nov-15 03:12
Re: More comet evidence in support of Velikovsky 274 Laird Scranton 01-Nov-15 05:37
Re: More comet evidence in support of Velikovsky 313 laughin 01-Nov-15 16:16
Re: More comet evidence in support of Velikovsky 207 Laird Scranton 01-Nov-15 16:31
Re: More comet evidence in support of Velikovsky 243 Aine 30-Oct-15 14:06
Re: More comet evidence in support of Velikovsky 228 laughin 30-Oct-15 14:53
Re: More comet evidence in support of Velikovsky 305 Aine 30-Oct-15 15:35
Re: More comet evidence in support of Velikovsky 244 carolb 30-Oct-15 15:36
Re: More comet evidence in support of Velikovsky 255 laughin 30-Oct-15 18:55
Re: More comet evidence in support of Velikovsky 275 Laird Scranton 30-Oct-15 16:44
Re: More comet evidence in support of Velikovsky 323 Aine 30-Oct-15 17:04
Re: More comet evidence in support of Velikovsky 265 carolb 30-Oct-15 17:21
Re: More comet evidence in support of Velikovsky 203 Laird Scranton 30-Oct-15 18:47
Re: More comet evidence in support of Velikovsky 251 laughin 30-Oct-15 18:44
Re: More comet evidence in support of Velikovsky 242 Laird Scranton 29-Oct-15 19:46
Re: More comet evidence in support of Velikovsky 260 laughin 29-Oct-15 20:48
Re: More comet evidence in support of Velikovsky 252 Laird Scranton 29-Oct-15 22:07
Re: More comet evidence in support of Velikovsky 243 carolb 29-Oct-15 22:24
Re: More comet evidence in support of Velikovsky 254 Starbinder 30-Oct-15 00:46
Re: More comet evidence in support of Velikovsky 245 Laird Scranton 30-Oct-15 01:01
Re: More comet evidence in support of Velikovsky 339 Aine 30-Oct-15 14:11
Re: More comet evidence in support of Velikovsky 248 Laird Scranton 30-Oct-15 15:42
Re: More comet evidence in support of Velikovsky 367 carolb 30-Oct-15 16:32
Re: More comet evidence in support of Velikovsky 222 Laird Scranton 30-Oct-15 16:51
Re: More comet evidence in support of Velikovsky 243 carolb 30-Oct-15 16:57
Re: More comet evidence in support of Velikovsky 209 Laird Scranton 30-Oct-15 17:02
Re: More comet evidence in support of Velikovsky 329 carolb 30-Oct-15 17:20
Re: More comet evidence in support of Velikovsky 213 OCaptain 30-Oct-15 20:07
Re: More comet evidence in support of Velikovsky 201 Laird Scranton 30-Oct-15 20:37
Re: More comet evidence in support of Velikovsky 299 OCaptain 31-Oct-15 00:51
Re: More comet evidence in support of Velikovsky 212 OCaptain 30-Oct-15 20:06
Re: More comet evidence in support of Velikovsky 256 Laird Scranton 30-Oct-15 20:34
Re: More comet evidence in support of Velikovsky 310 carolb 30-Oct-15 20:47
Re: More comet evidence in support of Velikovsky 202 Laird Scranton 30-Oct-15 21:09
Re: More comet evidence in support of Velikovsky 234 carolb 30-Oct-15 23:23
Re: More comet evidence in support of Velikovsky 227 Laird Scranton 31-Oct-15 00:49
Re: More comet evidence in support of Velikovsky 226 carolb 31-Oct-15 01:01
Re: More comet evidence in support of Velikovsky 194 Laird Scranton 31-Oct-15 01:10
Re: More comet evidence in support of Velikovsky 338 carolb 31-Oct-15 01:38
Re: More comet evidence in support of Velikovsky 199 Laird Scranton 31-Oct-15 02:56
Re: More comet evidence in support of Velikovsky 218 Laird Scranton 31-Oct-15 03:58
Re: More comet evidence in support of Velikovsky 308 carolb 31-Oct-15 12:01
Re: More comet evidence in support of Velikovsky 212 Laird Scranton 31-Oct-15 15:19
Re: More comet evidence in support of Velikovsky 202 Laird Scranton 31-Oct-15 15:47
Re: More comet evidence in support of Velikovsky 259 Laird Scranton 31-Oct-15 16:02
Re: More comet evidence in support of Velikovsky 241 Laird Scranton 31-Oct-15 18:26
Re: More comet evidence in support of Velikovsky 265 Laird Scranton 31-Oct-15 21:48
Re: More comet evidence in support of Velikovsky 210 Laird Scranton 01-Nov-15 00:27
Re: More comet evidence in support of Velikovsky 228 carolb 01-Nov-15 01:00
Re: More comet evidence in support of Velikovsky 228 Laird Scranton 01-Nov-15 01:36
Re: More comet evidence in support of Velikovsky 279 skakos 03-Nov-15 09:51
Conspiracy... 215 skakos 03-Nov-15 11:19
Re: More comet evidence in support of Velikovsky 204 OCaptain 30-Oct-15 20:02
Re: More comet evidence in support of Velikovsky 306 Laird Scranton 30-Oct-15 20:30
Re: More comet evidence in support of Velikovsky 193 OCaptain 31-Oct-15 00:56
Re: More comet evidence in support of Velikovsky 220 Laird Scranton 31-Oct-15 02:04
Re: More comet evidence in support of Velikovsky 204 OCaptain 31-Oct-15 12:14
Re: More comet evidence in support of Velikovsky 215 Laird Scranton 31-Oct-15 15:41
Re: More comet evidence in support of Velikovsky 172 OCaptain 31-Oct-15 20:03
Re: More comet evidence in support of Velikovsky 216 Laird Scranton 31-Oct-15 21:26
Re: More comet evidence in support of Velikovsky 212 OCaptain 01-Nov-15 12:10
Re: More comet evidence in support of Velikovsky 220 drrayeye 01-Nov-15 13:50
Re: More comet evidence in support of Velikovsky 246 carolb 01-Nov-15 15:11
Re: More comet evidence in support of Velikovsky 225 drrayeye 01-Nov-15 16:52
Re: More comet evidence in support of Velikovsky 237 Laird Scranton 01-Nov-15 16:56
Re: More comet evidence in support of Velikovsky 271 carolb 01-Nov-15 17:14
Re: More comet evidence in support of Velikovsky 204 Laird Scranton 01-Nov-15 18:27
Re: More comet evidence in support of Velikovsky 213 drrayeye 01-Nov-15 21:57
Re: More comet evidence in support of Velikovsky 185 Laird Scranton 01-Nov-15 16:03
Re: More comet evidence in support of Velikovsky 223 OCaptain 01-Nov-15 19:35
Re: More comet evidence in support of Velikovsky 308 Laird Scranton 01-Nov-15 20:34
Re: More comet evidence in support of Velikovsky 230 Starbinder 30-Oct-15 19:27
Re: More comet evidence in support of Velikovsky 265 carolb 30-Oct-15 20:01
Re: More comet evidence in support of Velikovsky 206 laughin 30-Oct-15 20:17
Re: More comet evidence in support of Velikovsky 246 Starbinder 30-Oct-15 20:24
Re: More comet evidence in support of Velikovsky 268 carolb 30-Oct-15 20:46
Re: More comet evidence in support of Velikovsky 277 Starbinder 30-Oct-15 21:14
Re: More comet evidence in support of Velikovsky 232 carolb 30-Oct-15 23:11
Re: More comet evidence in support of Velikovsky 214 Starbinder 31-Oct-15 01:05
Re: More comet evidence in support of Velikovsky 222 Starbinder 02-Nov-15 19:40
Re: More comet evidence in support of Velikovsky 251 carolb 02-Nov-15 21:21
Re: More comet evidence in support of Velikovsky 220 Starbinder 06-Nov-15 14:53
Re: More comet evidence in support of Velikovsky 367 carolb 06-Nov-15 15:16
Re: More comet evidence in support of Velikovsky 214 Starbinder 06-Nov-15 18:50
Re: More comet evidence in support of Velikovsky 227 carolb 06-Nov-15 20:10
What about scientism? 236 drrayeye 07-Nov-15 08:19
Re: What about scientism? 237 carolb 07-Nov-15 12:59
Re: What about scientism? 284 OCaptain 07-Nov-15 13:55
Re: What about scientism? 328 carolb 07-Nov-15 17:37
Re: What about scientism? 255 drrayeye 07-Nov-15 19:55
"Blue sky thinking" 249 randompHactor 07-Nov-15 20:15
Re: What about scientism? 243 carolb 07-Nov-15 20:41
Re: What about scientism? 224 drrayeye 07-Nov-15 23:36
Re: What about scientism? 217 carolb 07-Nov-15 23:45
Re: What about scientism? 256 laughin 09-Nov-15 02:51
Re: More comet evidence in support of Velikovsky 360 laughin 30-Oct-15 15:03
Re: More comet evidence in support of Velikovsky 326 OCaptain 29-Oct-15 23:20
Re: More comet evidence in support of Velikovsky 472 Laird Scranton 29-Oct-15 23:51
SUMMARY? 239 skakos 02-Nov-15 21:33
Mod Note > skakos – Switch View 243 Dr. Troglodyte 02-Nov-15 22:33
Re: SUMMARY? 338 Laird Scranton 02-Nov-15 23:22
Re: More comet evidence in support of Velikovsky 345 Laird Scranton 29-Oct-15 19:32
Re: More comet evidence in support of Velikovsky 196 Laird Scranton 02-Nov-15 16:53
Re: More comet evidence in support of Velikovsky 325 drrayeye 02-Nov-15 19:52
Re: More comet evidence in support of Velikovsky 175 Laird Scranton 02-Nov-15 21:02
Re: More comet evidence in support of Velikovsky 291 Laird Scranton 03-Nov-15 14:44
Re: More comet evidence in support of Velikovsky 182 drrayeye 03-Nov-15 16:09
Re: More comet evidence in support of Velikovsky 213 OCaptain 03-Nov-15 18:32
Re: More comet evidence in support of Velikovsky 206 Laird Scranton 03-Nov-15 18:46
Re: More comet evidence in support of Velikovsky 360 laughin 03-Nov-15 19:28
Re: More comet evidence in support of Velikovsky 183 laughin 03-Nov-15 19:02
Re: More comet evidence in support of Velikovsky 242 Laird Scranton 03-Nov-15 21:02
Re: More comet evidence in support of Velikovsky 211 Laird Scranton 03-Nov-15 04:58
Re: More comet evidence in support of Velikovsky 226 Ratcho 03-Nov-15 06:18
Re: More comet evidence in support of Velikovsky 194 Laird Scranton 03-Nov-15 14:30
Regarding myths... 216 skakos 03-Nov-15 11:46
Re: Regarding myths... 210 Laird Scranton 03-Nov-15 17:00
Re: off topic... 194 Ratcho 03-Nov-15 20:15
Re: More comet evidence in support of Velikovsky 276 skakos 04-Nov-15 13:28
Re: More comet evidence in support of Velikovsky 222 skakos 04-Nov-15 15:07
Re: More comet evidence in support of Velikovsky 209 skakos 04-Nov-15 15:11
Re: More comet evidence in support of Velikovsky 744 skakos 04-Nov-15 22:22
Re: More comet evidence in support of Velikovsky 342 Laird Scranton 05-Nov-15 01:11
Re: More comet evidence in support of Velikovsky 214 skakos 05-Nov-15 14:10
Re: More comet evidence in support of Velikovsky 216 Laird Scranton 05-Nov-15 14:23
Re: More comet evidence in support of Velikovsky 312 skakos 05-Nov-15 19:32
Re: More comet evidence in support of Velikovsky 204 Laird Scranton 05-Nov-15 19:42
Re: More comet evidence in support of Velikovsky 303 Laird Scranton 04-Nov-15 21:23
Cosmic Disconnect 222 laughin 06-Nov-15 15:00
Re: Cosmic Disconnect 181 OCaptain 07-Nov-15 13:49
Re: More comet evidence in support of Velikovsky 396 skakos 16-Nov-15 12:46
Re: More comet evidence in support of Velikovsky 312 OCaptain 16-Nov-15 13:54
Re: More comet evidence in support of Velikovsky 339 skakos 16-Nov-15 15:36
Re: More comet evidence in support of Velikovsky 415 OCaptain 17-Nov-15 01:23
Re: More comet evidence in support of Velikovsky 336 skakos 18-Nov-15 18:32
Re: More comet evidence in support of Velikovsky 357 Ratcho 18-Nov-15 18:45
Re: More comet evidence in support of Velikovsky 302 OCaptain 19-Nov-15 00:49
Re: More comet evidence in support of Velikovsky 381 skakos 19-Nov-15 07:24
Re: More comet evidence in support of Velikovsky 519 skakos 27-Dec-15 22:04


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