The best open source alternative to Universe Sandbox is Celestia, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 10 alternatives to Universe Sandbox and seven of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Universe Sandbox are Cosmonium (Free, Open Source), Pioneer (Free, Open Source), Orbiter (Free, Open Source) and Cosmographia (Paid, Open Source).
Celestia is an application for real-time 3D visualization of space, with a detailed model of the solar system, over 100,000 stars, more than 10,000 galaxies, and an extension mechanism for adding more objects.
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Celestia vs Universe Sandbox opinions
Some users think Celestia is a great alternative to Universe Sandbox, some don't.
it just shows the universe but can not minipulate it
Negative comment • over 1 year ago
you cannot use as a sandbox and you cannot do your own simulations
Negative comment • 30 days ago
You cannot do anything with Celestia like you can with Universe Sandbox.
Gravity and space simulator that allows you to learn about the gravitational force and explore and learn about space. Change the value of the gravitational constant, increase the mass of Jupiter to see how doing so would affect the solar system and much, much more!