Space-Time is a free, browser-based universe explorer and astronomy tool. No account, no ads, no install. You can fly from a planet's surface out to the edge of the observable universe, stand on the Moon or Mars and look up at the real sky for any date, watch real eclipses, and plan tonight's stargazing from your own backyard. It started as a passion project, basically the astronomy tool I wish I'd had in school. I'd love to hear what's confusing, what's missing, and what you'd build next.
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