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enhancements, but there have been no updates on the progress of the program since 2020. The original creator of
Celestia, Chris Laurel, created Fifth Star Labs shortly after Celestia's development stopped, and began working on an iOS-only planetarium app called Sky Guide. In late 2016, the official Celestia forums were restored, and development restarted under a new development team. As of 2018, beta testing builds of version 1.7.0 are available, as well as the bugfix releases 1.6.2 and 1.6.3, which were released in 2020 and 2023 respectively. Celestia was ported to mobile devices in 2020, and it continues to receive updates and experimental beta versions.
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Celestia can be extended with new objects, and has support for third-party, user-created add-ons available for installation, both fictional and realistic. Add-ons are commonly made up of plain text files, textures, and occasionally 3D models. Celestia also uses the custom CEL scripting language, and
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Educational add-ons can also be implemented in different languages. These activities provide approximately 40 hours of space journeys and astronomical lessons to include extensive tours of the
Celestia universe, the complete life cycle of stars, the Solar System, the human space program, the Search
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that was created in 2001 by Chris Laurel. The program allows users to virtually travel through the universe and explore celestial objects that have been catalogued. Celestia also doubles as a planetarium, but the user is not restricted to the Earth's surface, like in other planetarium software such
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are not available in
Celestia but are provided as add-ons by users. Additionally, most of the spacecraft included with Celestia 1.6.3 use outdated or low-quality models, such as the stock Mir model which is very basic and barely detailed, and the stock ISS model which hasn't had an update since
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Using the installed catalogues, the names of celestial objects can be displayed, including artificial satellites. The names and locations of Earth features such as continents, mountains, seas, oceans, and cities can also be displayed. Surface features on other celestial objects such as craters,
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bodies, including
Virtual Textures with coverage up to 65536 pixels wide (0.625 km/pixel at the Earth's equator), with selected coverage at higher resolutions. This allows closer views of well-mapped objects that have high-resolution VTs available for download. 3D models of historical and
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are included. In addition, objects in star systems are only drawn to a distance of one light-year from their parent stars, any further and they will simply not be rendered at all. Similarly, there is a render limit for stars at 10 million light-years in versions 1.6.3 and under, increased to 1
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Celestia's development stopped in 2013, with the final release in 2011. Since then, some of its development team went to work on celestia.Sci, a cosmological visualizer featuring more realistic rendering of galaxies and planets, gravitational lensing, and many other scientifically accurate
953:, more spacecraft, and a ton of more enhancements. In 2019, Celestia Forum member FarGetaNik created an addon pack called Project Echoes, featuring higher-quality renderings that replace all vanilla textures. Celestia 1.7.0 appears to use Project Echoes as inspiration for its textures.
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around 2007, meaning it is missing a lot of modules that have been added to the ISS since then. However, there are many add-ons that replace these models with higher-quality and more up-to-date ones. Fortunately, version 1.7.0 will include better models upon its final release.
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on orbiting satellites, and miscellaneous planetary details such as sunrise and sunset. Information about the objects that
Celestia draws can also be displayed, such as temperature, distance from observer, radius, rotational period, luminosity, and more.
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Celestia allows users to navigate at different speeds, and allow users to orbit stars, planets, moons, and other space objects, track space objects such as spacecraft, asteroids, and comets as they fly by, or travel to and/or fly through galaxies.
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billion light-years in 1.7.0. Any stars beyond that limit are not rendered, and stars that are close to the 1.7.0 render limit experience floating point errors, meaning their position is inaccurate. Finally, Celestia does not consider the
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are at fixed locations. As a result, the constellations in
Celestia do not gradually change shape as they do in the real world. In addition, Celestia's binary star catalogs only describe a few hundred systems of multiple stars. Most
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The user can change
Celestia's field of view, and the window can be split into multiple different panes, meaning that several objects can be displayed on the screen at once. Screenshots and movies can be captured in classic or
985:"). Character Timothy McGee explains what Celestia is and how an add-on can allow the user to store a diary within the program, as well. Textures designed by Celestia graphic artists were used in the movie
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The time simulated by
Celestia can be set to any time 2 billion years forward or backward from the present, although planetary orbits are only accurate within a few thousand years of the present day, and
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In mid 2016, a large addon pack project called
Celestia Origin was created, which replaces all vanilla textures and graphics with higher-quality renderings, adds more minor objects such as
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Wavelength filtering is not implemented in
Celestia's engine. The actual rendering tries to match human vision at the observer's position as accurately as possible. This means
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created a heavily modified version of Celestia in 2016, called VTS Timeloop, and it has since been used by multiple space agencies, including ESA and CNES themselves.
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for Extraterrestrial Intelligence (SETI), and depictions of astronomical events such as the formation of the Moon billions of years ago, and the possible
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approaching the Earth will not be deflected by the Earth's gravity unless the person who defined the NEO's trajectory for Celestia included that effect.
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and cannot go back or forward more than 2 billion years, and the default time-setting system cannot go further than the years -9999 or 9999.
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maps and multi-color nebulae are not part of the official distribution, but many are available as add-ons. Camera artifacts such as
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Celestia is available for download from its main website, celestiaproject.space, but it can be obtained from a large multitude of
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have used Celestia in their educational and outreach programs, as well as for interfacing to trajectory analysis software. The
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Upcoming Mars Express flight orbits until 7 January, getting closer to the Red Planet. Generated with Celestia software.
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satellites to appear to be in the wrong places in the sky when watched from the surface, even when the Earth's
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Numerous scripts are available. These include simple tours, reconstructions of complex space missions such as
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systems cannot be simulated with 100% accuracy because adequate orbital information is not yet available.
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from the Sun because the parallaxes of more distant stars are too small to be accurately measured by the
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with custom textures, more nebulae with full 3D and accurate models, more stars and galaxies, more
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of extensions are available in addition to the base program, produced by an active user community.
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move, and stars rotate about their axes and orbit each other in multiple star systems, stellar
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existing spacecraft are available flying in reasonably accurate trajectories, such as
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satellite. However, with the addition of Gaia data in 1.7.0, stars as far away as the
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are missing from the standard distribution. Many of these are available as add-ons.
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with inhabited worlds, spacecraft, cities, and special effects can also be added.
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resolutions. Celestia's support for gamepads and joysticks is relatively limited.
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websites as well. Between 2001 and May 2017, the former central distribution site
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of some stars induced by their planets, unless said wobbling is very noticeable.
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1899:"Project Echoes (Celestia Content Rework) - Release 0.1 - Celestia Forums"
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1514:"Welcome to restored Celestia Forums - Announcements - Celestia Forums"
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Celestia simulates the appearance of atmospheres on planets and moons,
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Although it is available, most languages are still a work in progress.
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Celestia does not include any stars that are more than a few thousand
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can be depicted, with planetary systems and 3D models—films such as
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Possible Earth 5 billion years from now when the Sun goes red giant
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Many types of astronomical objects are not included with Celestia.
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1564:"Celestia 1.7.0 windows installer - Development - Celestia Forums"
1331:"Celestia ported to AmigaOS4.1 - Celestia Users - Celestia Forums"
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An example of a user made fictional planetary system in Celestia
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Installation instructions for the add-ons are available on the
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Celestia was used in the media by the CBS television show
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Higher resolution surface textures are available for most
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An example of a user-created add-on which adds the nebula
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The Moon close-up, with a 64K VT (Virtual Texture) applied
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is specified, as Celestia does not simulate 3D surfaces.
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for stars (2 million with correct spatial coordinates),
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997:. Celestia has also appeared on the Science Channel's
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Some moons do not cast shadows on their planet during
1539:"Celestia 1.7.0 Development Thread - Celestia Forums"
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507:alongside the Hipparcos stars, with some data from
71:. Unsourced material may be challenged and removed.
1819:"The Celestia Motherlode: Educational Activities"
3289:
1128:There are three graphical front-ends available:
573:date arithmetic overflows at the year 5,874,774.
1382:"Mobile Celestia for Android - Celestia Forums"
3363:Lua (programming language)-scriptable software
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499:Celestia versions 1.6.3 and under display the
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2112:Archive of Windows, macOS, and Linux binaries
1932:National Aeronautics and Space Administration
1845:"Project "Celestia Origin" - Celestia Forums"
1399:
1307:"OS4Depot - Your one stop for AmigaOS4 files"
598:, which can execute many different commands.
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1766:
1654:
1227:"Celestia - Browse Files at SourceForge.net"
622:. The irregular surface of the Earth causes
479:counted approximately 12 million downloads.
1769:"List of Celestia addons - Celestia Forums"
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1356:"Mobile Celestia for iOS - Celestia Forums"
523:finder and to display the orbital paths of
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1638:"Release 1.6.3 · CelestiaProject/Celestia"
1614:"Release 1.6.2 · CelestiaProject/Celestia"
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158:
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559:basins and canyons can be shown as well.
131:Learn how and when to remove this message
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515:theory of planetary orbits to provide a
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610:TrES-4 Ab as depicted in Celestia 1.7.0
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945:and asteroids, while also adding more
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2134:
1741:"Gaia EDR3 for Celestia/celestia.Sci"
1093:List of space flight simulation games
835:, rotating magnetic fields, animated
652:Although objects that form part of a
594:improved CELX scripts written in the
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1987:
1842:
1040:Free and open-source software portal
69:adding citations to reliable sources
40:
3378:Android (operating system) software
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614:The default setting for Celestia's
13:
849:, or meteoric impacts such as the
14:
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2060:
2039:"Eurogamer's Summer of PC Plenty"
1990:"Space Trajectory Analysis (STA)"
3353:Educational software for Windows
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3136:
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2106:Current binaries and source code
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1712:"Download Statistics: All Files"
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710:Celestia also does not simulate
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3151:Category:Software that uses GTK
2030:
2010:
1981:
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1924:"Celestia Exploration Activity"
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1794:"The Celestia Motherlode: Home"
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229:1.6.4 / 5 November 2023
56:needs additional citations for
3348:Educational software for macOS
3328:Science software that uses GTK
3323:Planetarium software for Linux
2121:Instance of ESA using Celestia
1997:Delft University of Technology
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1122:
1113:
601:
1:
2037:Rossignol, Jim (2006-07-18).
1767:SevenSpheres (1 March 2020).
1159:
458:free and open source software
3358:Cross-platform free software
3343:Science software for Windows
1961:Closing in on the Red Planet
1957:"Mars Express orbit lowered"
1354:Markerz (20 February 2020).
1100:List of observatory software
1088:Space flight simulation game
482:
7:
2110:Celestia Archive Repository
1025:
809:International Space Station
10:
3394:
3338:Science software for macOS
1928:NASA Learning Technologies
1433:"celestia.Sci Development"
970:French Space Agency (CNES)
749:
462:GNU General Public License
428:Celestia is available for
36:Celestial (disambiguation)
29:
18:
16:Astronomy computer program
3318:Free educational software
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1380:Markerz (21 March 2020).
892:, and TV shows including
567:is an optional function.
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196:Celestia Development Team
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32:Celestia (disambiguation)
2414:Glade Interface Designer
1437:Celestial Matters Forums
1106:
991:and the 2008 miniseries
981:(Season 4, Episode 22: "
596:Lua programming language
19:Not to be confused with
3303:Free astronomy software
2126:Celestia.Mobi main site
1255:"Celestia localization"
1015:among a top 20 list of
231:; 10 months ago
3308:Planetarium technology
2685:Avant Window Navigator
1934:. 2005. Archived from
1870:"Celestia Origin | VK"
1823:celestiamotherlode.net
1798:celestiamotherlode.net
988:The Day After Tomorrow
930:
805:Hubble Space Telescope
778:
767:
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660:is not simulated, and
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206:; 23 years ago
3033:OpenShot Video Editor
1965:European Space Agency
1903:celestiaproject.space
1849:celestiaproject.space
1773:celestiaproject.space
1691:celestiaproject.space
1568:celestiaproject.space
1543:celestiaproject.space
1518:celestiaproject.space
1467:www.fifthstarlabs.com
1411:celestiaproject.space
1386:celestiaproject.space
1360:celestiaproject.space
1335:celestiaproject.space
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877:2001: A Space Odyssey
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204:26 February 2001
2075:at Wikimedia Commons
1687:"Celestia: Download"
1078:Planetarium software
1000:Through the Wormhole
994:The Andromeda Strain
936:terraforming of Mars
819:(nebulae, galaxies,
373:Educational software
65:improve this article
30:For other uses, see
3235:WorldWide Telescope
2207:GTK Scene Graph Kit
1443:on 24 February 2017
1073:Orbiter (simulator)
872:Fictional universes
501:Hipparcos Catalogue
460:released under the
145:
3333:AmigaOS 4 software
3313:Astronomy software
3202:Astronomy software
2642:PCMan File Manager
1494:. November 6, 2023
1063:Gravity (software)
947:extrasolar planets
931:
912:role-playing games
851:Chelyabinsk meteor
811:, as are extended
781:Well over 80
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760:
742:Celestia uses the
707:are not rendered.
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529:extrasolar planets
497:
495:survey in Celestia
409:is a real-time 3D
182:Original author(s)
143:
3368:Portable software
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3127:
3126:
2896:Vino (VNC server)
2526:Core Applications
2502:
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2498:
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2323:
2217:Language bindings
2104:GitHub repository
2071:Media related to
1589:"Celestia GitHub"
1463:"Fifth Star Labs"
920:planetary systems
837:solar prominences
833:planetary aurorae
716:near-Earth object
714:. For example, a
505:Tycho-2 Catalogue
442:Microsoft Windows
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312:Microsoft Windows
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2911:transmission-gtk
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2657:Graphical shells
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2092:Official website
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865:Deep Impact
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602:Limitations
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2222:PyGTK
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