Uchuu is a large cosmological simulation of dark matter and the universe’s large-scale structure. Its creators generated 3 petabytes of output, but the 2021 release described a compressed catalog of about 100 terabytes—not a 3,000-terabyte file for casual download. The project announced public data access through cloud infrastructure, though the cited sources do not establish whether that access route or its instructions still work today.
What Uchuu simulates
Uchuu models the evolution of dark matter and large-scale structure over nearly 13.8 billion years, from the Big Bang to the present, according to the Center for Computational Astrophysics’ 2021 release. Its largest simulation contains 2.1 trillion dark matter particles in a cube 2.0 gigaparsecs per side when expressed in the paper’s convention of Gpc/h. The institutional release describes that scale as 9.63 billion light-years per side.
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This is not a rendered, photographic universe or a simulation of every object people see in astronomy images. Uchuu follows dark matter and the formation of halos and large-scale structure; individual stars and planets are not resolved. Researchers can use the simulated structures to investigate how the universe’s matter is distributed and changes over time.
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Why the headline says 3,000 TB
The 3-petabyte figure refers to data generated during the project, not the size of a single download. Tomoaki Ishiyama, the code’s developer, said the work used 20 million supercomputer hours and generated 3 petabytes of data. The institutional release then described compressed information organized into a 100-terabyte catalog. Those are different measures: generated output versus a compressed data collection.
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Even the 100-terabyte figure is a large-scale research dataset, not a small home download. A local copy would require substantial storage and a suitable way to transfer and work with the files; the cited sources do not specify a recommended consumer drive setup or say that local storage is necessary.
What data was released
The 2021 Data Release 1 paper lists several publicly available products. These are research data products, rather than a single interactive movie of the universe.
- Subsets of simulation particles
- Matter power spectra
- Catalogs of dark matter halos and subhalos
- Merger trees, which trace how structures are related across time
The paper also described gravitational lensing maps and mock catalogs for galaxies, X-ray clusters, and active galactic nuclei as future releases at the time it was published. That wording is historical; it does not by itself confirm the present status of those products. The paper is Ishiyama et al., Uchuu Data Release 1.
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Can you download Uchuu now?
The project’s 2021 institutional announcement said the catalog was available through cloud infrastructure and linked readers to the Uchuu page on Skies & Universes. The available sources establish that public data products were released, but they do not verify that the historical access page, account requirements, formats, or download instructions remain active today. The project’s GitHub organization provides public code and tool repositories, but that is not confirmation that the simulation data itself can currently be downloaded there.
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If you want to try to access the data, start with the project page referenced by the 2021 institutional announcement and check its current documentation for availability, registration requirements, product sizes, and transfer methods. Do not assume that obtaining the entire 3-petabyte generated output is an option; the release distinguished that output from its compressed catalog and listed particular data products.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why researchers use a simulation like this
Simulations make it possible to study cosmic structure across enormous volumes and long spans of time under controlled conditions. A researcher can examine how dark matter halos form and connect, then compare those structures with observations or build further analyses from the released products. Julia F. Ereza, a doctoral researcher at IAA-CSIC who uses Uchuu to study large-scale structure, described it as a way to inspect the universe at different times and scales. That flexibility is scientific analysis, not a guarantee that the public interface offers a simple consumer-style visualization.
The project’s scale also came at a considerable computational cost: Ishiyama reported 20 million supercomputer hours. That figure describes the computation behind the work, not a requirement for someone who downloads a prepared product; the sources do not specify the hardware needed for particular analyses.
Quick Recap
Sources
- Center for Computational Astrophysics, 2021 institutional release
- Ishiyama et al., Uchuu Data Release 1 paper
- Futurism’s 2021 coverage
- Uchuu project GitHub organization
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