What you will find here
Four kinds of page, all built from open data.
- Milky Way season: the best months and dates to see the center of our galaxy, worked out for each US national park from its own latitude, longitude and cloud record.
- Space by the numbers: how many satellites are in orbit, how many rockets launch each year, and which countries and companies fly them, with the definition behind each count.
- Space calculators: your weight and age on other worlds, and how long light, a jet or a spacecraft takes to get there.
- Mysteries, Voyager 1, Europa and the scale of the solar system: what we measured, what we infer, what we don't know, and what would settle it.
How we keep it honest
We separate the sure parts from the guesses. Where scientists measured something, we say so. Where they infer it, we say that instead. Where nobody knows, we say that too. Big distances get a human-sized comparison so the numbers mean something.
Our method is written down on How we work, and every dataset and photo source is listed on Sources and credits. If something looks wrong, tell us.
Night vision mode
If you read this outside, the button at the top of every page switches the site to red and gray so it doesn't spoil your night vision. It stays on for 30 days on that device.
Who we are
Space Osmosis is an independent project. It isn't part of NASA, ESA, the National Park Service or any other agency, and none of them has reviewed or endorsed it.