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Topics	Replies	Views	Last post
Physics, Astronomy & Cosmology \ What is the speed of light in a vacuum? Started by EvaH	20	4305	Last post by yor_on 23/06/2021 04:44:10
Physics, Astronomy & Cosmology \ Why is light bent whent it passes a massive body in the space? Started by sciencepm	49	5382	Last post by Janus 17/02/2021 18:09:52
Physics, Astronomy & Cosmology \ What do you call the coloured light that comes out of stained glass? Started by One More Question	17	36909	Last post by RobC 19/01/2021 10:41:40
Physics, Astronomy & Cosmology \ Is this simplification of Quantum Erasing correct? Started by HenryBraxton	10	2473	Last post by hamdani yusuf 05/01/2021 22:22:10
Physics, Astronomy & Cosmology \ Is there a simple explanation of Bell's experiment? Started by RobC	9	2239	Last post by RobC 26/12/2020 09:49:39
Physics, Astronomy & Cosmology \ How does light move in a vacuum? Started by geordief	22	3952	Last post by JasonBailey 11/12/2020 13:00:27
Physics, Astronomy & Cosmology \ Could gravity be like temperature and not be able to be quantised? Started by RobC	9	2373	Last post by evan_au 02/10/2020 02:15:46
Physics, Astronomy & Cosmology \ I rate 'many worlds' people together with flat-earthers. Am I wrong? Started by RobC	11	2214	Last post by Petrochemicals 16/08/2020 20:30:40
Physics, Astronomy & Cosmology \ How do we know the Universe is expanding, and expanding into nothing? Started by 0	43	28153	Last post by CPT ArkAngel 22/07/2020 05:10:15
Physics, Astronomy & Cosmology \ An expanding flat universe? Started by Harri	14	3076	Last post by Bill S 15/06/2020 14:40:49
Physics, Astronomy & Cosmology \ Has physics made any meaningful progress in the last 40 years? Started by RobC	9	2129	Last post by hamdani yusuf 08/06/2020 04:31:05
Physics, Astronomy & Cosmology \ Is the speed of light constant? Started by EvaH	26	4417	Last post by hamdani yusuf 01/06/2020 18:36:41
Physics, Astronomy & Cosmology \ Do electromagnetic waves have a fixed speed? Started by EvaH	20	3329	Last post by Bored chemist 24/05/2020 13:04:08
Physics, Astronomy & Cosmology \ Why do some burnt matches float and others sink? Started by nudephil	1	5043	Last post by RobC 26/02/2020 18:09:55
Physics, Astronomy & Cosmology \ Was the Big Bang the beginning of the universe? Started by Akabiz	280	36693	Last post by Bill S 17/11/2019 13:22:57
Physics, Astronomy & Cosmology \ What happens when both slits are observed by in the double slit experiment? Started by Lloyd	38	10053	Last post by Halc 11/11/2019 14:45:39
Physics, Astronomy & Cosmology \ What is the cosmic microwave background? Started by HelpMe929	54	9190	Last post by Halc 18/10/2019 12:30:40
That CAN'T be true! \ LIGO represents an mirror displacement of what? Started by alright1234	109	17389	Last post by Bored chemist 10/09/2019 20:42:49
Physics, Astronomy & Cosmology \ What are the implications of a change in the Hubble constant? Started by RobC	5	1865	Last post by jeffreyH 11/08/2019 15:51:09
Physics, Astronomy & Cosmology \ How well do laymen understand Bell's theorem? Started by jeffreyH	4	1931	Last post by Bill S 07/08/2019 17:47:43