WebGalaxy Clusters. Galaxy clusters are the largest objects in the universe that are held together by their own gravity. They contain hundreds or thousands of galaxies, lots of hot plasma, and a large amount of invisible dark matter. The Perseus Cluster, for example, has more than a thousand galaxies and is one of the most luminous sources of X ... WebIf there is just enough matter in the universe for its gravitational force to bring the expansion associated with the big bang to a stop in an infinitely long time, the universe is said to be …

Astronomy Unit 7 Test Flashcards Quizlet

A "closed universe" is necessarily a closed manifold. An "open universe" can be either a closed or open manifold. For example, in the Friedmann–Lemaître–Robertson–Walker (FLRW) model the universe is considered to be without boundaries, in which case "compact universe" could … See more The shape of the universe, in physical cosmology, is the local and global geometry of the universe. The local features of the geometry of the universe are primarily described by its curvature, whereas the See more As stated in the introduction, there are two aspects to consider: 1. its local geometry, which predominantly concerns the … See more Global structure covers the geometry and the topology of the whole universe—both the observable universe and beyond. While the local … See more • Geometry of the Universe at icosmos.co.uk • Janna Levin, Evan Scannapieco & Joseph Silk (1998). "The topology of the universe: the biggest manifold of them … See more The curvature is a quantity describing how the geometry of a space differs locally from the one of the flat space. The curvature of any locally isotropic space (and hence of a locally isotropic universe) falls into one of the three following cases: 1. Zero … See more • de Sitter space – Maximally symmetric Lorentzian manifold with a positive cosmological constant • Ekpyrotic universe – Cosmological … See more WebNov 4, 2024 · Here, we further investigate the evidence for a closed Universe from Planck, showing that positive curvature naturally explains the anomalous lensing amplitude, and demonstrating that it also... hometown glencoe menu

What is dark energy? - Earth & Sky

Web[ ŏs ′ə-lā′tĭng ] A model of a closed universe in which the expansion of the universe slows and reverses, thereby causing a collapse into a singularity, which then expands into a … WebThe Universe is a big, open place. You are in the Universe. Things you can't see are in it, too. The biggest stars are in it. Even the smallest things on Earth are part of the Universe. We don't even know how big the Universe is! Image to right: Amoebas live on Earth. They are in the Universe. They are very small. hometown glory high contrast remix