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A package for modelling the Universe.

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This package contains methods for modelling the Universe, galaxies and the Milky Way. SkyPy simulates populations of astronomical objects, generating random realisations of intrinsic and observed properties, with the intention the simulations can then be compared to data as part of an inference pipeline.

Currently, SkyPy implements the following modules:

  • Galaxies: morphology, luminosity and redshift distributions

  • Pipelines to generate populations of astronomical objects

The full list of features can be found in the SkyPy Documentation.

For more information on the people involved and how SkyPy is developed, please visit the SkyPy Collaboration website:


JOSS SkyPy Concept DOI

If you use SkyPy for work or research presented in a publication please follow our Citation Guidelines.


PyPI conda-forge

SkyPy releases are distributed through PyPI and conda-forge. Instructions for installing SkyPy and its dependencies can be found in the Installation section of the documentation.


SkyPy has a driver script that can run simulation pipelines from the command line. The documentation contains a description of the Pipeline module and Examples that demonstrate how to use it.

Get in Touch

You are welcome to talk about the SkyPy package and code using our Discussions Page. For any other questions about the project in general, please get in touch with the SkyPy Co-ordinators.


We love contributions! SkyPy is open source, built on open source, and we’d love to have you hang out in our community. For information on how to contribute see our Contributor Guidelines. All communication relating to The SkyPy Project must meet the standards set out in the Code of Conduct.

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