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	Re: 2019: On this day . . . Mona - Astronomy #930874 04/24/19 03:19 AM Joined: May 2010 Posts: 11,963 Likes: 30 United Kingdom Mona - Astronomy OP BellaOnline Editor Renaissance Human OP Mona - Astronomy BellaOnline Editor Renaissance Human Joined: May 2010 Posts: 11,963 Likes: 30 United Kingdom On this day in 1920 - April 26th - the Shapley-Curtis debate took place on the nature and distance of "spiral nebulae". Even less than a century ago, we didn't know what the "spiral nebulae" were. Were they objects in our Milky Way galaxy and therefore comparatively close? Or were they "island universes", i.e., other galaxies, and therefore at a great distance?

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Mona - Astronomy 08/17/19 09:11 AM Re: 2019: On this day . . . Mona - Astronomy 08/18/19 10:04 AM Re: 2019: On this day . . . Mona - Astronomy 08/18/19 10:17 AM Re: 2019: On this day . . . Mona - Astronomy 08/19/19 09:43 AM Re: 2019: On this day . . . Mona - Astronomy 08/19/19 10:06 AM Re: 2019: On this day . . . Mona - Astronomy 08/20/19 09:30 AM Re: 2019: On this day . . . Mona - Astronomy 08/20/19 09:45 AM Re: 2019: On this day . . . Mona - Astronomy 08/21/19 09:00 AM Re: 2019: On this day . . . Mona - Astronomy 08/22/19 08:34 AM Re: 2019: On this day . . . Mona - Astronomy 08/23/19 09:01 AM Re: 2019: On this day . . . Angie 08/23/19 07:24 PM Re: 2019: On this day . . . Mona - Astronomy 08/24/19 09:21 AM Re: 2019: On this day . . . Mona - Astronomy 08/25/19 08:59 AM Re: 2019: On this day . . . Mona - Astronomy 08/25/19 09:17 AM Re: 2019: On this day . . . Mona - Astronomy 08/25/19 09:19 AM Re: 2019: On this day . . . Mona - Astronomy 08/26/19 08:39 AM Re: 2019: On this day . . . Mona - Astronomy 08/27/19 09:29 AM Re: 2019: On this day . . . Mona - Astronomy 08/28/19 07:00 AM Re: 2019: On this day . . . Mona - Astronomy 08/29/19 08:02 AM Re: 2019: On this day . . . Mona - Astronomy 08/30/19 03:22 PM Re: 2019: On this day . . . Mona - Astronomy 08/31/19 09:18 AM Re: 2019: On this day . . . Mona - Astronomy 09/01/19 08:30 AM Re: 2019: On this day . . . Mona - Astronomy 09/02/19 07:31 AM Re: 2019: On this day . . . Mona - Astronomy 09/04/19 02:50 PM Re: 2019: On this day . . . Mona - Astronomy 09/05/19 02:06 PM Re: 2019: On this day . . . Mona - Astronomy 09/06/19 03:36 PM Re: 2019: On this day . . . Mona - Astronomy 09/07/19 01:10 PM Re: 2019: On this day . . . Mona - Astronomy 09/07/19 01:59 PM Re: 2019: On this day . . . Mona - Astronomy 09/08/19 04:41 PM Re: 2019: On this day . . . Mona - Astronomy 09/09/19 02:38 PM Re: 2019: On this day . . . Mona - Astronomy 09/09/19 02:43 PM Re: 2019: On this day . . . Mona - Astronomy 09/10/19 03:47 PM Re: 2019: On this day . . . Mona - Astronomy 09/10/19 03:50 PM Re: 2019: On this day . . . Mona - Astronomy 09/10/19 03:56 PM Re: 2019: On this day . . . Mona - Astronomy 09/11/19 01:30 PM Re: 2019: On this day . . . Mona - Astronomy 09/11/19 03:44 PM Re: 2019: On this day . . . Mona - Astronomy 09/11/19 03:44 PM Re: 2019: On this day . . . Mona - Astronomy 09/12/19 03:13 PM Re: 2019: On this day . . . Mona - Astronomy 09/12/19 03:15 PM Re: 2019: On this day . . . Mona - Astronomy 09/13/19 09:31 PM Re: 2019: On this day . . . Mona - Astronomy 09/14/19 07:03 PM Re: 2019: On this day . . . Mona - Astronomy 09/15/19 04:38 PM Re: 2019: On this day . . . Mona - Astronomy 09/16/19 04:12 PM Re: 2019: On this day . . . Mona - Astronomy 09/17/19 01:36 PM Re: 2019: On this day . . . Mona - Astronomy 09/18/19 05:11 AM Re: 2019: On this day . . . Mona - Astronomy 09/18/19 05:19 AM Re: 2019: On this day . . . Mona - Astronomy 09/19/19 05:17 PM Re: 2019: On this day . . . Mona - Astronomy 09/19/19 05:31 PM Re: 2019: On this day . . . Mona - Astronomy 09/20/19 09:36 AM Re: 2019: On this day . . . Mona - Astronomy 09/20/19 09:36 AM Re: 2019: On this day . . . Mona - Astronomy 09/21/19 05:44 AM Re: 2019: On this day . . . Mona - Astronomy 09/21/19 10:04 AM Re: 2019: On this day . . . Mona - Astronomy 09/24/19 12:03 PM Re: 2019: On this day . . . Mona - Astronomy 09/24/19 12:13 PM Re: 2019: On this day . . . Mona - Astronomy 09/24/19 12:19 PM Re: 2019: On this day . . . Mona - Astronomy 09/24/19 12:25 PM Re: 2019: On this day . . . Mona - Astronomy 09/25/19 09:15 AM Re: 2019: On this day . . . Mona - Astronomy 09/25/19 09:21 AM Re: 2019: On this day . . . Mona - Astronomy 09/25/19 09:23 AM Re: 2019: On this day . . . Mona - Astronomy 09/26/19 06:47 AM Re: 2019: On this day . . . Mona - Astronomy 09/26/19 06:56 AM Re: 2019: On this day . . . Mona - Astronomy 09/27/19 08:59 PM Re: 2019: On this day . . . Mona - Astronomy 09/28/19 11:00 AM Re: 2019: On this day . . . Mona - Astronomy 09/29/19 06:41 AM Re: 2019: On this day . . . Mona - Astronomy 09/30/19 06:48 PM Re: 2019: On this day . . . Mona - Astronomy 10/01/19 08:22 PM Re: 2019: On this day . . . Mona - Astronomy 10/01/19 08:24 PM Re: 2019: On this day . . . Mona - Astronomy 10/02/19 03:43 AM Re: 2019: On this day . . . Mona - Astronomy 10/03/19 06:43 AM Re: 2019: On this day . . . Mona - Astronomy 10/08/19 12:26 AM Re: 2019: On this day . . . Mona - Astronomy 10/08/19 12:28 AM Re: 2019: On this day . . . Mona - Astronomy 10/08/19 12:34 AM Re: 2019: On this day . . . Mona - Astronomy 10/08/19 12:36 AM Re: 2019: On this day . . . Mona - Astronomy 10/08/19 12:42 AM Re: 2019: On this day . . . Mona - Astronomy 10/08/19 01:02 PM Re: 2019: On this day . . . Mona - Astronomy 10/08/19 01:05 PM Re: 2019: On this day . . . Angie 10/08/19 07:21 PM Re: 2019: On this day . . . Mona - Astronomy 10/09/19 02:59 PM Re: 2019: On this day . . . Mona - Astronomy 10/09/19 03:08 PM Re: 2019: On this day . . . Mona - Astronomy 10/10/19 08:34 AM Re: 2019: On this day . . . Mona - Astronomy 10/10/19 08:37 AM Re: 2019: On this day . . . Mona - Astronomy 10/11/19 10:51 AM Re: 2019: On this day . . . Mona - Astronomy 10/12/19 11:44 AM Re: 2019: On this day . . . Mona - Astronomy 10/13/19 11:31 PM Re: 2019: On this day . . . Mona - Astronomy 10/14/19 12:28 AM Re: 2019: On this day . . . Mona - Astronomy 10/14/19 12:31 AM Re: 2019: On this day . . . Mona - Astronomy 10/15/19 10:53 AM Re: 2019: On this day . . . Mona - Astronomy 10/15/19 10:53 AM Re: 2019: On this day . . . Mona - Astronomy 10/23/19 04:03 PM Re: 2019: On this day . . . Mona - Astronomy 10/23/19 04:06 PM Re: 2019: On this day . . . Mona - Astronomy 10/23/19 04:12 PM Re: 2019: On this day . . . Mona - Astronomy 10/23/19 04:15 PM Re: 2019: On this day . . . Mona - Astronomy 10/23/19 04:17 PM Re: 2019: On this day . . . Mona - Astronomy 10/23/19 04:20 PM Re: 2019: On this day . . . Mona - Astronomy 10/23/19 04:23 PM Re: 2019: On this day . . . Mona - Astronomy 10/23/19 04:25 PM Re: 2019: On this day . . . Mona - Astronomy 10/23/19 04:30 PM Re: 2019: On this day . . . Mona - Astronomy 10/23/19 04:34 PM Re: 2019: On this day . . . Mona - Astronomy 10/23/19 04:38 PM Re: 2019: On this day . . . Mona - Astronomy 10/24/19 08:41 PM Re: 2019: On this day . . . Mona - Astronomy 10/24/19 08:48 PM Re: 2019: On this day . . . Mona - Astronomy 10/24/19 08:50 PM Re: 2019: On this day . . . Mona - Astronomy 10/25/19 09:06 AM Re: 2019: On this day . . . Mona - Astronomy 10/25/19 09:09 AM Re: 2019: On this day . . . Mona - Astronomy 10/26/19 10:58 AM Re: 2019: On this day . . . Mona - Astronomy 10/27/19 01:28 PM Re: 2019: On this day . . . Mona - Astronomy 10/27/19 01:33 PM Re: 2019: On this day . . . Mona - Astronomy 10/28/19 01:24 PM Re: 2019: On this day . . . Mona - Astronomy 10/29/19 08:20 PM Re: 2019: On this day . . . Mona - Astronomy 10/30/19 02:54 PM Re: 2019: On this day . . . Mona - Astronomy 10/31/19 01:55 PM Re: 2019: On this day . . . Mona - Astronomy 11/01/19 01:14 PM Re: 2019: On this day . . . Mona - Astronomy 11/02/19 02:27 PM Re: 2019: On this day . . . Mona - Astronomy 11/02/19 02:30 PM Re: 2019: On this day . . . Mona - Astronomy 11/03/19 03:28 PM Re: 2019: On this day . . . Mona - Astronomy 11/03/19 03:33 PM Re: 2019: On this day . . . Mona - Astronomy 11/04/19 09:57 AM Re: 2019: On this day . . . Mona - Astronomy 11/05/19 04:08 PM Re: 2019: On this day . . . Mona - Astronomy 11/06/19 10:13 AM Re: 2019: On this day . . . Mona - Astronomy 11/06/19 10:25 AM Re: 2019: On this day . . . Mona - Astronomy 11/07/19 09:10 PM Re: 2019: On this day . . . Mona - Astronomy 11/08/19 09:54 AM Re: 2019: On this day . . . Mona - Astronomy 11/08/19 10:00 AM Re: 2019: On this day . . . Mona - Astronomy 11/09/19 03:31 PM Re: 2019: On this day . . . Mona - Astronomy 11/12/19 06:07 AM Re: 2019: On this day . . . Mona - Astronomy 11/12/19 06:08 AM Re: 2019: On this day . . . Mona - Astronomy 11/12/19 06:14 AM Re: 2019: On this day . . . Mona - Astronomy 11/12/19 06:25 AM Re: 2019: On this day . . . Mona - Astronomy 11/13/19 08:40 AM Re: 2019: On this day . . . Mona - Astronomy 11/14/19 08:12 AM Re: 2019: On this day . . . Mona - Astronomy 11/14/19 08:18 AM Re: 2019: On this day . . . Mona - Astronomy 11/15/19 07:18 AM Re: 2019: On this day . . . Mona - Astronomy 11/15/19 07:21 AM Re: 2019: On this day . . . Mona - Astronomy 11/15/19 09:01 PM Re: 2019: On this day . . . Mona - Astronomy 11/19/19 06:43 AM Re: 2019: On this day . . . Mona - Astronomy 11/19/19 06:47 AM Re: 2019: On this day . . . Mona - Astronomy 11/19/19 06:50 AM Re: 2019: On this day . . . Angie 11/19/19 08:12 PM Re: 2019: On this day . . . Mona - Astronomy 11/20/19 08:51 AM Re: 2019: On this day . . . Mona - Astronomy 11/20/19 08:53 AM Re: 2019: On this day . . . Mona - Astronomy 11/20/19 08:57 AM Re: 2019: On this day . . . Mona - Astronomy 11/20/19 09:00 AM Re: 2019: On this day . . . Mona - Astronomy 11/20/19 09:03 AM Re: 2019: On this day . . . Mona - Astronomy 11/20/19 03:59 PM Re: 2019: On this day . . . Mona - Astronomy 11/21/19 08:43 AM Re: 2019: On this day . . . Mona - Astronomy 11/22/19 08:13 AM Re: 2019: On this day . . . Mona - Astronomy 11/22/19 08:17 AM Re: 2019: On this day . . . Mona - Astronomy 11/23/19 07:25 AM Re: 2019: On this day . . . Mona - Astronomy 11/24/19 06:21 AM Re: 2019: On this day . . . Mona - Astronomy 11/25/19 09:11 AM Re: 2019: On this day . . . Mona - Astronomy 11/26/19 05:37 AM Re: 2019: On this day . . . Mona - Astronomy 11/27/19 02:35 PM Re: 2019: On this day . . . Mona - Astronomy 11/28/19 11:41 AM Re: 2019: On this day . . . Mona - Astronomy 11/29/19 10:59 AM Re: 2019: On this day . . . Mona - Astronomy 11/30/19 11:35 AM Re: 2019: On this day . . . Mona - Astronomy 11/30/19 04:28 PM Re: 2019: On this day . . . Mona - Astronomy 12/01/19 10:36 AM Re: 2019: On this day . . . Mona - Astronomy 12/02/19 09:48 AM Re: 2019: On this day . . . Mona - Astronomy 12/02/19 09:52 AM Re: 2019: On this day . . . Mona - Astronomy 12/03/19 03:43 PM Re: 2019: On this day . . . Mona - Astronomy 12/04/19 09:21 AM Re: 2019: On this day . . . Mona - Astronomy 12/04/19 09:54 AM Re: 2019: On this day . . . Mona - Astronomy 12/05/19 01:48 PM Re: 2019: On this day . . . Mona - Astronomy 12/05/19 01:51 PM Re: 2019: On this day . . . Mona - Astronomy 12/06/19 08:40 AM Re: 2019: On this day . . . Mona - Astronomy 12/06/19 08:47 AM Re: 2019: On this day . . . Mona - Astronomy 12/07/19 08:56 AM Re: 2019: On this day . . . Mona - Astronomy 12/07/19 08:59 AM Re: 2019: On this day . . . Mona - Astronomy 12/08/19 09:02 AM Re: 2019: On this day . . . Mona - Astronomy 12/09/19 06:49 AM Re: 2019: On this day . . . Mona - Astronomy 12/10/19 04:20 AM Re: 2019: On this day . . . Mona - Astronomy 12/11/19 09:17 AM Re: 2019: On this day . . . Mona - Astronomy 12/12/19 08:16 AM Re: 2019: On this day . . . Mona - Astronomy 12/12/19 08:19 AM Re: 2019: On this day . . . Mona - Astronomy 12/14/19 07:49 AM Re: 2019: On this day . . . Mona - Astronomy 12/15/19 09:56 AM Re: 2019: On this day . . . Mona - Astronomy 12/16/19 09:52 AM Re: 2019: On this day . . . Mona - Astronomy 12/17/19 02:16 PM Re: 2019: On this day . . . Mona - Astronomy 12/18/19 11:25 AM Re: 2019: On this day . . . Mona - Astronomy 12/19/19 10:16 AM Re: 2019: On this day . . . Mona - Astronomy 12/20/19 11:10 AM Re: 2019: On this day . . . Mona - Astronomy 12/21/19 10:28 AM Re: 2019: On this day . . . Mona - Astronomy 12/21/19 10:30 AM Re: 2019: On this day . . . Mona - Astronomy 12/22/19 12:06 PM Re: 2019: On this day . . . Mona - Astronomy 12/23/19 09:49 AM Re: 2019: On this day . . . Mona - Astronomy 12/24/19 11:06 AM Re: 2019: On this day . . . Mona - Astronomy 12/24/19 04:39 PM Re: 2019: On this day . . . Mona - Astronomy 12/25/19 10:41 AM Re: 2019: On this day . . . Mona - Astronomy 12/25/19 10:44 AM Re: 2019: On this day . . . Mona - Astronomy 12/26/19 11:43 AM Re: 2019: On this day . . . Mona - Astronomy 12/27/19 07:33 PM Re: 2019: On this day . . . Mona - Astronomy 12/28/19 10:13 AM Re: 2019: On this day . . . Mona - Astronomy 12/29/19 12:07 PM Re: 2019: On this day . . . Mona - Astronomy 12/30/19 09:00 AM Re: 2019: On this day . . . Mona - Astronomy 12/31/19 11:00 AM