Extreme Planet Makeover lets visitors create new worlds, instantly, online.
The website—a collaboration between NASA’s Jet Propulsion Lab and Caltech—lets you adjust your planet’s size and age, its distance from the sun, and the kind of star that sun is. You can make gas giants or tiny, Pluto-like rocks, or aim for the sweet spots in between. When you’re done, visit the Planet Gallery and stack your world up against other planets in our own solar system—or a few that lie far beyond it.
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