﻿ Astronomy Picture of the Day [1]Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2023 December 31 IFRAME: [2]https://www.youtube.com/embed/QSivvdIyeG4?si=CNXSnbIN_HXYZG0e?rel=0 Illustris: A Simulation of the Universe Video Credit: [3]Illustris Collaboration, [4]NASA, [5]PRACE, [6]XSEDE, [7]MIT, [8]Harvard CfA; Music: The Poisoned Princess ([9]Media Right Productions) Explanation: How did we get here? [10]Click play, sit back, and watch. A [11]computer simulation of the evolution of the universe provides insight into how [12]galaxies formed and perspectives into [13]humanity's place in the universe. The [14]Illustris project [15]exhausted 20 million CPU hours in 2014 following 12 billion resolution elements spanning a cube 35 million [16]light years on a side as it evolved over 13 billion years. [17]The simulation tracks matter into the [18]formation of a wide variety of [19]galaxy types. As the virtual universe evolves, some of the matter expanding with the [20]universe soon gravitationally condenses to form filaments, [21]galaxies, and [22]clusters of galaxies. The [23]featured video takes the perspective of a virtual camera circling part of this changing universe, first showing the evolution of [24]dark matter, then [25]hydrogen gas coded by temperature ([26]0:45), then heavy elements such as [27]helium and [28]carbon ([29]1:30), and then back to [30]dark matter ([31]2:07). On the lower left the time since the [32]Big Bang is listed, while on the lower right the type of matter being shown is listed. Explosions (0:50) depict galaxy-center supermassive black holes expelling bubbles of hot gas. Interesting discrepancies between [33]Illustris and the [34]real universe have been studied, including why [35]the simulation produced an overabundance of old stars. Tomorrow's picture: a grand design __________________________________________________________________ [36]< | [37]Archive | [38]Submissions | [39]Index | [40]Search | [41]Calendar | [42]RSS | [43]Education | [44]About APOD | [45]Discuss | [46]> __________________________________________________________________ Authors & editors: [47]Robert Nemiroff ([48]MTU) & [49]Jerry Bonnell ([50]UMCP) NASA Official: Phillip Newman [51]Specific rights apply. [52]NASA Web Privacy Policy and Important Notices A service of: [53]ASD at [54]NASA / [55]GSFC, [56]NASA Science Activation & [57]Michigan Tech. U. 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