When it comes to the atoms we are familiar with, hydrogen makes up about 75 percent, while helium makes up about 25 percent, with heavier elements making up only a tiny fraction of the universe's atoms, according to NASA. What shape is it? Erwin Schrödinger and the Quantum Revolution by John Gribbin: review". The Telegraph. 5 April 2012 . Retrieved 24 September 2023. Ellis says that scientists have proposed the idea of the multiverse as a way of explaining the nature of existence. He points out that it ultimately leaves those questions unresolved because it is a metaphysical issue that cannot be resolved by empirical science. He argues that observational testing is at the core of science and should not be abandoned: [58]

Parhizkar, Alireza; Galitski, Victor (2022). "Moiré Gravity and Cosmology". arXiv: 2204.06574 [ hep-th]. Bedford, Bailey. "Bilayer graphene inspires two-universe cosmological model". Joint Quantum Institute . Retrieved 22 June 2022. J. Schmidhuber (2002): The Speed Prior: A New Simplicity Measure Yielding Near-Optimal Computable Predictions. Proc. 15th Annual Conference on Computational Learning Theory (COLT 2002), Sydney, Australia, Lecture Notes in Artificial Intelligence, pp. 216–228. Springer: IDSIA – Dalle Molle Institute for Artificial Intelligence When you talk about the CMB appearing equidistant around us, at a distance which is a function of the expansion of space over time, you are describing what may well be an absolute limit to our perception.Vilenkin, Alex (2007). Many Worlds in One: The Search for Other Universes. Farrar, Straus and Giroux. ISBN 9780374707149. For each day and the week ahead. The texts are the ones used in the UK: the Jerusalem Bible and the Grail psalms. You can get more translations from the apps and programs. Over the course of the several billion years that followed, the slightly denser regions of the Universe’s matter (which was almost uniformly distributed) began to become gravitationally attracted to each other. They therefore grew even denser, forming gas clouds, stars, galaxies, and the other astronomical structures that we regularly observe today. Boyle, Latham; Finn, Kieran; Turok, Neil (20 December 2018). "CPT-Symmetric Universe". Physical Review Letters. 121 (25): 251301. arXiv: 1803.08928. Bibcode: 2018PhRvL.121y1301B. doi: 10.1103/PhysRevLett.121.251301. PMID 30608856. S2CID 58638592.

Tegmark, Max (May 2003). "Parallel Universes". Scientific American. 288 (5): 40–51. arXiv: astro-ph/0302131. Bibcode: 2003SciAm.288e..40T. doi: 10.1038/scientificamerican0503-40. PMID 12701329. Feeney, Stephen M.; etal. (2011). "First observational tests of eternal inflation: Analysis methods and WMAP 7-year results". Physical Review D. 84 (4): 43507. arXiv: 1012.3667. Bibcode: 2011PhRvD..84d3507F. doi: 10.1103/PhysRevD.84.043507. S2CID 43793857. It is possible that the universe has a more complicated shape overall while seeming to possess a different curvature. For instance, the universe could have the shape of a torus, or doughnut. Expanding universe

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Although the expansion of the universe gradually slowed down as the matter in the universe pulled on itself via gravity, about 5 or 6 billion years after the Big Bang, according to NASA, a mysterious force now called dark energy began speeding up the expansion of the universe again, a phenomenon that continues today. https://cdn.iflscience.com/images/4a22cda7-0ef5-5226-9ed3-e80c4cf053c7/default-1510334289-cover-image.jpg Cosmologist Max Tegmark has provided a taxonomy of universes beyond the familiar observable universe. The four levels of Tegmark's classification are arranged such that subsequent levels can be understood to encompass and expand upon previous levels. They are briefly described below. [62] [63] Level I: An extension of our universe [ edit ]