Celestia

An open-source real-time 3D space simulator for exploring the solar system, stars and galaxies.

FreeOpen sourceWindowsmacOSLinux
Official websitecelestiaproject.space

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About Celestia

Celestia is a real-time 3D space simulator that lets you travel through a model of the universe and look at planets, moons, stars and galaxies from any point in space. Unlike a flat sky chart, it shows objects in three dimensions and lets you move between them freely.

It is an open-source project maintained by a community of contributors. It suits students, teachers and anyone curious about astronomy who wants to explore space interactively on their own computer.

Strengths

  • Free, real-time 3D exploration of space
  • Move freely between planets, stars and galaxies
  • Open-source and community maintained

Limitations

  • Project website blocks automated visitors with a proof-of-work check
  • A simulator for exploration rather than a structured astronomy course

Details

Pricing
FreeFree and open source.
License
GPL-2.0
Developer
The Celestia contributors
Platforms
Windows, macOS, Linux
How it runs
Downloadable app
Account
Not required
Best suited for
Students and astronomy enthusiasts who want to explore space in 3D
Categories
Learning tools
Last verified
Added
Provenance
Facts checked against the developer's own pages and store listings, 1 sources on file.

Alternatives to Celestia

Compare all

Software that can replace Celestia for an important use case, and what changes if you switch.

  • Stellarium

    A planetarium on your screen showing exactly what is in the sky above you, tonight or on any date you choose.

    FreeOpen sourceWindowsmacOSLinuxAndroidiOS

    Stellarium is an open-source GPL-2.0 planetarium showing the sky from a chosen location and date, adding Android and iOS versions and telescope control.

  • KStars

    A free, open-source desktop planetarium from KDE for simulating the sky and planning observations.

    FreeOpen sourceWindowsmacOSLinux

    KStars is a free open-source KDE desktop planetarium focused on sky simulation, observation planning and astrophotography rather than free flight between galaxies.

Similar software

Related functionality, not necessarily a direct replacement.

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