中文翻譯:
有一天，小朋友們在星空下仰望天空，問道：「我們能看到多遠呢？」這時，宇航員小亮告訴大家，當我們用眼睛看宇宙時，能看到的部分叫做「可觀測宇宙」。在這片宇宙中，最遠的地方來自13.8億年前的宇宙微波背景，就像一層厚厚的霧一樣。小朋友們聽了都驚訝不已，因為即使有些東西像中微子和引力波從更遙遠的地方來，但我們還沒有能力去探測它們！小亮說，這張圖片展示了可觀測宇宙的樣子，地球和太陽在中間，四周有我們的太陽系、鄰近的星星、遙遠的星系，還有早期物質的纖維，最後是宇宙微波背景。科學家們經常認為，我們的可觀測宇宙只是更大宇宙的一部分。在這裡，科學會依然存在！不過，有些人也在想，或許我們的宇宙其實還是更大的「多重宇宙」的一部分，裡面可能還有不同的物理法則和未來的版本！
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
來源:NASA每日圖片
