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Paul Byrne
theplanetaryguy.bsky.social
did:plc:wwbktud2d34ont3frkv73pjo
That small dot moving left to right is 3I/ATLAS.
It's a comet that was discovered on 1 July 2025.
It's travelling at 58 km PER SECOND and isn't gravitationally bound to the Sun.
Which means you're looking at a comet that formed around another star, passing through the Solar System.
2025-07-05T12:09:46.538Z