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Topics	Replies	Views	Last post
Physics, Astronomy & Cosmology \ What happens to the spacetime interval between two events as they approach a BH? Started by geordief	13	353	Last post by Halc 20/02/2021 16:19:26
Physics, Astronomy & Cosmology \ How does mass-energy curve spacetime? Started by geordief	2	192	Last post by geordief 19/02/2021 22:28:35
Physics, Astronomy & Cosmology \ Are there any serious ideas floating around about Wormholes? Started by geordief	4	438	Last post by geordief 22/12/2020 11:46:35
Physics, Astronomy & Cosmology \ What is the smallest theoretical magnet? Started by geordief	6	561	Last post by evan_au 15/12/2020 19:44:27
Physics, Astronomy & Cosmology \ How does light move in a vacuum? Started by geordief	22	1394	Last post by JasonBailey 11/12/2020 13:00:27
Physics, Astronomy & Cosmology \ What is a small classical example of em radiation? Started by geordief	2	429	Last post by evan_au 22/06/2020 23:51:13
Physics, Astronomy & Cosmology \ Is the equivalence principle only approximately correct? Started by geordief	19	2270	Last post by Colin2B 12/01/2020 23:57:28
Physics, Astronomy & Cosmology \ When did gravity begin? Started by geordief	10	1381	Last post by yor_on 15/12/2019 22:19:41
Physics, Astronomy & Cosmology \ Is the vacuum synonymous with the absence of a medium? Started by geordief	3	894	Last post by jeffreyH 07/11/2019 19:54:39
Physics, Astronomy & Cosmology \ Can we say that we "fall through spacetime"? Started by geordief	8	1292	Last post by geordief 31/10/2019 00:20:19
Physics, Astronomy & Cosmology \ Does the invariance of c have a role in the theories around Inflation/Expansion? Started by geordief	0	631	Last post by geordief 29/09/2019 15:25:15
Physics, Astronomy & Cosmology \ Special Relativity without Light Started by geordief	3	909	Last post by jeffreyH 22/09/2019 14:16:38
Physics, Astronomy & Cosmology \ Can we talk about a "Speed of Causality"? Started by geordief	1	819	Last post by yor_on 02/07/2019 10:49:51
Physics, Astronomy & Cosmology \ Is "Space" distinct from "nothingness"? (and the Vacuum) Started by geordief	36	4274	Last post by pensador 30/06/2019 22:47:32
Physics, Astronomy & Cosmology \ Is there a speed of propagation of energy? Started by geordief	5	1165	Last post by jeffreyH 24/06/2019 22:30:40
Physics, Astronomy & Cosmology \ Does the Universe expand into itself? Started by geordief	0	709	Last post by geordief 12/06/2019 00:48:30
Physics, Astronomy & Cosmology \ What if the Earth was twice as massive? Started by geordief	21	2178	Last post by Halc 10/06/2019 00:27:59
Physics, Astronomy & Cosmology \ What causes relative motion? Started by geordief	12	982	Last post by yor_on 03/06/2019 08:20:04
Physics, Astronomy & Cosmology \ Is spacetime always understood in relation to the speed of light (em radiation)? Started by geordief	24	2205	Last post by Halc 22/05/2019 20:25:33
Physics, Astronomy & Cosmology \ Is the magnetic field in a particle accelerator static or dynamic? Started by geordief	2	851	Last post by evan_au 07/05/2019 21:00:59