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... The Free, Open Source - space simulation that lets you explore our universe in three dimensions.
Celestia runs on Windows, Linux, and Mac OS X.

Unlike most planetarium software, Celestia doesn't confine you to the surface of the Earth. You can travel throughout the solar system, to any of over 100,000 stars, or even beyond the galaxy. All movement in Celestia is seamless; the exponential zoom feature lets you explore space across a huge range of scales, from galaxy clusters down to spacecraft only a few meters across. A 'point-and-goto' interface makes it simple to navigate through the universe to the object you want to visit.

Celestia is expandable. Celestia comes with a large catalog of stars, galaxies, planets, moons, asteroids, comets, and spacecraft. If that's not enough, you can download dozens of easy to install add-ons with more objects.

Celestia Motherlode
The Celestia «Motherlode» is the central repository for Celestia add-ons.
Hundreds of add-ons are available on the Motherlode with thumbnail screen shots for easy browsing.

Celestia Add-ons

The Celestia Motherlode
The Celestia Motherlode is the central repository for Celestia add-ons. Hundreds of add-ons are available on the Motherlode with thumbnail screen shots for easy browsing.

Selden's List of Resources for Celestia
Selden Ball has created a very helpful introduction to creating add-ons for Celestia. If some of your favorite astronomical objects are missing from Celestia, or if you want to create an entirely ficitious planetary system, then you'll be interested in reading this add-on introduction.

•Related Sites•
Celestia Texture Foundry
Fridger Schrempp's Texture Foundry has detailed, high quality textures for the major planets and moons of the Solar System.

Celestia Web Ring
The Celestia Web Ring is a community of Celestia-related sites.

Jack's Celestia Add-ons
Jack is a prolific creator of add-ons for Celestia. He has produced models and trajectories for many famous (and not-so-famous) space missions.

Mostly Harmless
Marc Griffith is creating an Elite like space game based on Celestia. The project is currently on hold, but an early version is available along with a solar system generator called Stargen.

Celestia-win32 v.1.5.1
April 24, 2008

Celestia 1.5.1 is a bug fix and internationalization update. The new package includes more complete translations along with glyph sets for Russian, Chinese, and Japanese.

Changes:

• Added fonts for Russian, Chinese, and Japanese
• Updated translations
• Fixed date formatting for non-UTF8 locales
• Fixed crash for dates prior to JD -1.5 when local format is used
• Fixed star rendering for Macs with ATI graphics hardware (worked around a driver bug in point sprite support.)
• Fixed star glare clipping bug
• Fixed bug that caused some stars to be drawn untextured
• Fixed faster/slower options in the Windows time menu to adjust time by 10x instead of 2x
• Fixed translation of time acronyms DST and STD
• Use localized versions of start script, guide, demo, license, and controls
  file from locale directory
• Fixed Windows 98/ME input problem; most keyboard commands weren't working on
  the OSes.
• Made Lua os functions available from celx scripts when access policy is "ask"

Download: SourceForge»