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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.

Fun fact: It's actually going 61 km/s (relative to the sun)but it's expected to slow to 58 km/s as it gains distance after a max speed (at perihelion) of 68 km/s.