NASA-funded ATLAS (Asteroid Terrestrial-impact Last Alert System) telescope in Chile first detected interstellar comet on July 1, 2025 that has now been named 3I/ATLAS. The object was then found in images from other telescopes going back to June 14 that confirm it is coming from outside the Solar System and passing through at a high velocity.
https://science.nasa.gov/blogs/planetary-defense/2025/07/02/nasa-discovers-interstellar-comet-moving-through-solar-system/