Talk:Universe

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Good article Universe has been listed as one of the Natural sciences good articles under the good article criteria. If you can improve it further, please do so. If it no longer meets these criteria, you can reassess it.

Dark radiation[edit]

What about dark radiation? Isn't it part of the Universe too? 2001:8003:8551:C200:65D4:B3F2:2E0B:F3FE (talk) 14:39, 23 February 2017 (UTC)

See the section "Dark energy". --ChetvornoTALK 16:42, 23 February 2017 (UTC)

SENSE[edit]

Original: "Further observational improvements led to the realization that our Solar System is located in the Milky Way galaxy and is one of many solar systems and galaxies."

Should be: "Further observational improvements led to the realization that our Solar System is located in the Milky Way galaxy and is one of many solar systems and THE MILKY WAY ONE OF MANY galaxies." — Preceding unsigned comment added by Cysus (talkcontribs)

Already done by Chetvorno (talk). And thank you for pointing that out! regards, DRAGON BOOSTER 07:00, 6 January 2017 (UTC)

First sentence.[edit]

Can we have a look at this? Presently the first sentence reads "The Universe is all of time and space and its contents." What is "its" referring to? Time and space? If so, then it might be argued that the sentence should read "The Universe is all of time and space and their contents."? This doesn't seem very good to me. Alternatively, we might say "The Universe is all of spacetime and its contents.", but then I wonder if we should be using the concept of "spacetime" in the first sentence of an article that might be read by people unfamiliar with such a concept. A bit of tuning might be in order. Isambard Kingdom (talk) 14:54, 18 February 2017 (UTC)

Hasn't the lead been pretty thoroughly discussed? I think the current lead was decided in this discussion: Talk:Universe/Archive_3#An_issue_with_the_definition, which you participated in. It seems to me that the consensus was that the definition needed to be limited to the contents of spacetime (as opposed to more inclusive definitions of "everything") but that, as you say, the technical word "spacetime" was not going to be familiar to general readers, so it was replaced with "time and space and its contents". I feel that's a pretty good compromise. I don't care what possessive pronoun is used, "its" or "theirs" is fine. --ChetvornoTALK 17:57, 18 February 2017 (UTC)
Yes, I recall that discussion. I raised it because another editor recently made a change to the first sentence, and I did't want to just brush it off. At the same time, I acknowledge that this issue has been pretty much beaten up. Thanks, Isambard Kingdom (talk) 18:44, 18 February 2017 (UTC)
Ah, I see. --ChetvornoTALK 04:49, 19 February 2017 (UTC)
Space and time are two things, but all of them is just one everything. Sometimes it's hard to think of "all" as a noun because it doesn't have a clear shape or colour, but once you get over that hump, the Universe makes sense. InedibleHulk (talk) 23:38, March 9, 2017 (UTC)

Chronology and the Big Bang[edit]

"Thus, in the early part of the matter-dominated era, stable protons and neutrons formed, which then formed atomic nuclei through nuclear reactions." This sentense has a problem. To the best of my layperson knowledge, matter did not dominate the mass-energy density of the universe until 47 thousand years after primordial nucleosynthesis ended. Instead the nucleosynthesis happened during the radiation-dominated era. 2601:441:4102:9010:6C02:87A4:248A:9E70 (talk) 19:38, 5 March 2017 (UTC)

Minor scaling typo to be corrected, please.[edit]

In section "4.2 Size and regions", the following edit should be made:

Current, erroneous version "the diameter of a typical galaxy is 30,000 light-years (9,198 parsecs), and the typical distance between two neighboring galaxies is 3 million light-years. (919.8 million parsecs)"

Correct version "the diameter of a typical galaxy is 30,000 light-years (9,198 parsecs), and the typical distance between two neighboring galaxies is 3 million light-years. (919.8 kiloparsecs)"

Yes check.svg Done Thank you, Isambard Kingdom (talk) 12:40, 25 March 2017 (UTC)