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Polishing a telescope mirror to perfection | Space photo of the day for Oct. 6, 2025

It's a delicate process in which science meets craftsmanship in the Chilean desert.

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Science history: On the night of Oct. 5, 1923, Edwin Hubble observed a strange star that flickered in intensity at regular intervals. The star, dubbed M31-V1, was key to showing that the universe extended far beyond the borders of the Milky Way.

International Observe the Moon Night 2025: 4 things to see on the lunar surface on Oct. 4

Astronauts work through the U.S. government shutdown | On the International Space Station Sept. 29-Oct. 3, 2025

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