Simulated Galaxy Redshift Cubes

  • Released Tuesday, March 22nd, 2022
  • Updated Wednesday, May 3rd, 2023 at 11:44AM
  • ID: 14105

These visualizations show the number and clustering of simulated galaxies at different cosmic ages, ranging from 4% to 43% of the universe’s current age of 13.8 billion years. Each cube represents a fixed volume of space about 100 million light-years per side. Over the sequence, the expansion of the universe quickly lowers the density of galaxies. Each cube shows a specific cosmological redshift, from 9 to 1, with earlier cubes cast in redder shades.

The visualizations use data from a realistic simulation developed by Zhongxu Zhai and Yun Wang at IPAC and Andrew Benson at Carnegie Observatories to investigate the expected precison and accuracy of the High Latitude Spectroscopic Survey from NASA’s Roman Space Telescope. The full simulation contains 65 million galaxies.

These six cubes show the simulated distribution of galaxies at redshifts 9, 7, 5, 3, 2, and 1, with the corresponding cosmic ages shown. As the universe expands, the density of galaxies within each cube decreases, from more than half a million at top left to about 80 at lower right. Each cube is about 100 million light-years across. Galaxies assembled along vast strands of gas separated by large voids, a foam-like structure echoed in the present-day universe on large cosmic scales.

Credit: NASA’s Goddard Space Flight Center/F. Reddy and Z. Zhai, Y. Wang (IPAC) and A. Benson (Carnegie Observatories)

Watch this video on the Video YouTube channel.

Complete transcript available.

This visualization shows the simulated galaxy distribution at redshift 9, when the universe was just 551 million years old. The cube is about 100 million light-years across and contains 528,000 galaxies.

Credit: NASA’s Goddard Space Flight Center/F. Reddy and Z. Zhai, Y. Wang (IPAC) and A. Benson (Carnegie Observatories)

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NASA's Goddard Space Flight Center. However, individual items should be credited as indicated above.


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