Stellarium is free, open-source planetarium software that lets you explore a realistic simulation of the night sky from your computer.
You can use Stellarium to discover stars, identify constellations, explore planets and see how the sky changes according to your location, date and time.
The desktop software is available for compatible Windows, macOS and Linux systems. Check the current download options and system requirements before installing. Separately offered mobile apps or optional services may have different pricing.
Offer at a glance
This offer covers the free desktop software. Other products using the Stellarium name may have separate prices or requirements.
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What Is Stellarium?
Stellarium is a desktop planetarium application designed to simulate what you would see in the night sky. Its three-dimensional sky display includes stars, planets, constellations and other astronomical objects.
Unlike a live telescope feed, Stellarium creates a simulated view of the sky. You can explore different viewing locations and times, making it useful for learning astronomy, identifying objects and preparing for observing sessions.
Whether you’re learning the constellations, introducing children to astronomy or planning an evening of stargazing, the program offers a way to explore the sky before heading outdoors.
What Can You Do With Stellarium?
Stellarium includes a collection of astronomy features that help users understand the night sky.
- Explore stars and constellations: View a realistic sky and identify familiar star patterns.
- Find planets: Explore the locations of planets and other objects in the simulated sky.
- Change locations: See how the sky appears from different places.
- Explore dates and times: Move through different dates to understand how the sky changes.
- Plan stargazing: Preview objects and viewing directions before going outdoors.
You do not need to own a telescope to start using Stellarium. A compatible computer is enough to explore its basic simulated sky.
Check the System Requirements
Before downloading Stellarium, make sure your computer meets the requirements listed by the project.
The published minimum requirements include a 64-bit operating system, compatible graphics support, at least 1 GiB of memory and approximately 1 GiB of disk space. The project recommends higher specifications for a better experience.
Available builds and supported operating-system versions vary. Some Windows versions, for example, are supported through different software builds.
If you’re using an older computer or an organization-managed device, review compatibility and installation permissions before proceeding.
How to Download Stellarium for Free
- Open the Stellarium download page. Click the blue Download Stellarium for Free button to visit the approved Stellarium destination.
- Find your operating system. Look for the Windows, macOS or Linux download options.
- Check compatibility. Review the available builds and current system requirements before choosing a download.
- Download the appropriate version. Select the desktop software package intended for your computer.
- Follow the installation instructions. Install the program according to the guidance for your operating system.
- Open Stellarium. Set your location and time to begin exploring the simulated night sky.
Tips for Exploring the Night Sky
Start with a location you recognize. Stellarium can display a simulated view based on the selected position and time, helping you connect the software with the sky outside your home.
Try identifying a familiar constellation, then change the date or time to see how its apparent position changes.
You can also explore planets, bright stars and the Milky Way. For beginners, learning a few recognizable objects is often a useful starting point before exploring more of the program’s features.
If you plan to observe outdoors, remember that weather, clouds, light pollution and nearby obstacles may affect what you can actually see.
Is Stellarium Really Free?
Yes. The Stellarium project offers its desktop planetarium software as free, open-source software.
The free desktop program is different from separately distributed mobile products and optional services, which may have their own terms or prices.
You should not need to purchase a mobile application simply to use the free desktop software. Choose the download that matches your computer and review the current information on the project website.
Stellarium can be a useful educational resource for students, families, astronomy enthusiasts and anyone curious about the night sky.
