可觀測的宇宙
The Observable Universe

發表日期:2025-11-23
你能看到多遠?假設你的眼睛可以探測到周圍所有型別的輻射,那麼你現在所能看到的一切,以及你可能看到的一切,就是可觀測的宇宙。 在光線中,我們能看到的最遠處來自宇宙微波背景, 138 億年前的宇宙像濃霧一樣不透明。我們周圍的一些中微子和引力波來自更遠的地方,但人類還沒有探測它們的技術。這張特寫圖片說明了可觀測到的宇宙尺度越來越緊湊,以地球和太陽為中心,周圍環繞著太陽系、附近的恆星、附近的星系、遙遠的星系、早期物質絲和宇宙微波背景。宇宙學家通常認為,我們可觀測到的宇宙只是被稱為 "宇宙 "的更大實體的附近部分,在這個實體中,同樣的物理學原理也適用。 然而,有幾種流行但推測性的推論認為,即使我們的宇宙也是一個更大的多元宇宙的一部分,在這個多元宇宙中,要麼存在不同的物理常數,要麼適用不同的物理定律,要麼存在更高的維度,要麼存在與我們的標準宇宙略有不同的偶然版本。 探索可觀測的宇宙:隨機 APOD 生成器
原文:How far can you see? Everything you can see, and everything you could possibly see, right now, assuming your eyes could detect all types of radiations around you -- is the observable universe. In light, the farthest we can see comes from the cosmic microwave background, a time 13.8 billion years ago when the universe was opaque like thick fog. Some neutrinos and gravitational waves that surround us come from even farther out, but humanity does not yet have the technology to detect them. The featured image illustrates the observable universe on an increasingly compact scale, with the Earth and Sun at the center surrounded by our Solar System, nearby stars, nearby galaxies, distant galaxies, filaments of early matter, and the cosmic microwave background. Cosmologists typically assume that our observable universe is just the nearby part of a greater entity known as "the universe" where the same physics applies. However, there are several lines of popular but speculative reasoning that assert that even our universe is part of a greater multiverse where either different physical constants occur, different physical laws apply, higher dimensions operate, or slightly different-by-chance versions of our standard universe exist. Explore the Observable Universe: Random APOD Generator
※ 本文由萌芽機器人自動轉貼自每日一天文圖(Astronomy Picture of the Day,APOD),原文為英文,正體中文是透過 DeepL 翻譯及 OpenCC 進行自動處理,內容僅供參考,若有任何錯誤之處還請見諒!
關於每日一天文圖:每日一天文圖網站是美國國家航空暨太空總署與密西根理工大學提供的服務,網站每天提供一張影像或圖片,並由天文學家撰寫扼要說明其特別之處。