Every tracked satellite and half a million asteroids, where they are right now
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Fly anywhere in the universe from a browser tab, on real catalog data
A free, browser-only SpaceEngine alternative with a dome mode and follow-along links is the first real option for planetariums and teachers who cannot buy Windows software.
Farseer is a browser-based universe simulator by Shane Loeffler. It draws on real catalogs (HYG stars, NASA Exoplanet Archive, 2MASS, OpenNGC, HyperLEDA) and fills the gaps with procedural generation, so you can fly to the Whirlpool Galaxy, see its real image, then enter a 3D model derived from it and visit individual stars. It has a dome projection mode aimed at small planetariums, a share mode where others follow your journey by link, and keyboard flight controls. Free, no adverts, nothing for sale. Mobile controls are rough and the dome mode is untested in a real planetarium.
Every tracked satellite and half a million asteroids, where they are right now
Guess where in the solar system a rover panorama or orbital view was taken
A streaming-style front end for requesting and filing your home media library
Fly a camera past a Schwarzschild black hole and watch light bend, in a browser
A sky map for Android with lessons, a journal and a red night mode, no sign-up
Wikipedia's deep-time table, rebuilt as a 3D journey you scroll through