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NASA astronaut Megan McArthur retires after two decades of remarkable contributions, including piloting the SpaceX Dragon and crucial work on the Hubble Space Telescope. McArthur's career highlights her technical expertise and leadership, notably as the final astronaut to operate Hubble with the space shuttle's robotic arm.

NASA has shared new details about 3I/ATLAS. It is an interstellar object moving at 209,000 km/h. Hubble images show it is smaller than thought, about 5.6 km wide. It is a comet with a glowing tail. Scientists estimate it is eight billion years old. It poses no threat to Earth. NASA uses telescopes to study it.