Talk:Spacetime/Archive 26

This is an archive of past discussions about Spacetime. Do not edit the contents of this page. If you wish to start a new discussion or revive an old one, please do so on the current talk page.

Нет магнита - net magnitnogo polya. Net electrona - net electricheskogo polya.

Net vacuuma - net radiovolnы ..

Это такие "мозгокривия" ..

🙀 👀 💃 💪 😇 🤪 😏 85.140.9.236 (talk) 05:25, 13 July 2023 (UTC)

The article's claim that "A position in spacetime is called an event" is false and misleading. This mistake can be remedied by editing this claim to state that "a non-empty set of points in spacetime may be, but is not necessarily, the location of an event that is "concrete." An event that is "abstract" is so-named because it is "abstracted" (removed) from a location in spacetime. Thus, for example, the event of a "rock concert" is abstract if lacking a position in spacetme and "concrete" if having such a location. 2601:647:5A00:6E30:C48F:2BD7:EB9D:2CD7 (talk) 23:23, 19 June 2023 (UTC)

You want to replace event with a long and very wordy explanation. "Less is more." 173.12.107.22 (talk) 17:40, 5 August 2023 (UTC)

Superstring theory: 6D hyperspace + common 4D = 10D spacetime or Supergravity theory & M-theory: 7D hs + 4D = 11D st. Unified String Theory 21 or 19 Dimensions & Aspects of Spacetime – Physics’ Theory of Everything (TOE): Superstring & M-theory + time analysis providing a very simple symmetry breaking. 7D hyperspace + 3D regular space + 7 aspects regular time + 4A hypertime = 21 dimensions and19 aspects of21 spacetime or 6D hs + 3D rs + 6A rt + 4A ht = 19D&A st engineerable: Plan-it Nestor. Da (Rus). Dada. Lalibela. 1921 AD Albert Einstein: Kalusa 5D, Nobel, 1st U(21)S(19). FDR, Tulsa, Tampa Bay, IE. 21% oxygen. 21 dot die. Blackjack. Stephen Hawkings ALS age 21. 21st cent. 19/21-gun-salutr. Uvalde 19/21 shot. 12 Dimensional Aspects of Time Eternal (DATE) 6A or 7A rt: beginning, end, past, present, future, void? a constant - speed-of-light + 4A ht: fast-forward/time dilation, reverse, stop, before beginning & after end of Universal-Conglomeratal time (11/11 11:00), 12. imaginary time (N/A). 12 lu mo+12 d=leap year, solar year=12 mo/zodiac. y Jupiter/Chinese zodiac/FDR. hrs & 5 min. sec. Letter l 12. 12”. Cube 12 lines. Titan/Olym. Caesars/Tables. Ishmael7/Israel6 sons, gems, spies, MP. Jesus Christ age 12. Bat Mitzvah. Mary Magdalene 12x in Bible, Apostles John, baskets, gates, fruit. 12 Days of Christmas/Drummers, 12th Night. Ages/12.21.12. Imams. RT nights. Dz. Steps. Tones 12√2, bars, string. States. Jury. D-Day nations, NATO. Carbon. Cranial nerves. Holidays. Grades. Fermions. MJ-12. Gemini, Apollo 12/on Moon. Adam-. Brady. Stories. Superior highly composite number. 2607:FB91:1993:15C9:3C72:EB31:2B95:3A28 (talk) 00:48, 6 August 2023 (UTC)

You don't say. —Tamfang (talk) 21:58, 2 September 2023 (UTC)

I find the paragraph `Spacetime interval` misleading, it introduces pythagoeran distance, and calls it invariant

``Although two viewers may measure the x, y, and z position of the two points using different coordinate systems, the distance between the points will be the same for both (assuming that they are measuring using the same units). The distance is "invariant".``

while the sentence is technically true for euclidean geometry, in newtonian spacetime, distance between events is not invariant for moving observers if the events are separated by time, i think this paragraph should highlight what was introduced by special relativity, not what was introduced by addition of time. Lorentz contraction can be mentioned separately, here maybe its better to highlight time itself as the invariant variable in newtonian physics. Ondrosaurus89 (talk) 11:49, 18 September 2023 (UTC)

The lead says spacetime is a mathematical model. But we all live within spacetime, meaning spacetime can't just be a mathematical model. Spacetime is what we live in.

As far as we know, spacetime is a four dimensional thing that generally has everything in it, except for the stuff that is very far away, or very old, or through black holes or across other exotic boundaries.

I think the lead should be updated. 96.227.223.203 (talk) 03:13, 5 September 2023 (UTC)

Spacetime is a model for representing, describing, and predicting the universe and behavior its astronomical bodies. It's typical in science to use abstracted representations of objects, phenomena, etc. Our understanding of spacetime is not necessarily correct or complete. Basically, we don't necessarily live in our idea of spacetime. But these models can give us some idea of how we can expect things to behave. 2600:1700:D580:8680:CC69:C05D:1BB3:FBDD (talk) 05:59, 30 March 2024 (UTC)

I don't think this terminology is helpful. Can we improve the description of a euclidean geometry please? Thx :) 189.158.98.184 (talk) 14:26, 11 November 2023 (UTC)