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I recently saw the International Space Station without a telescope. Are there any other man-made space objects that can be seen using bare eyes?

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Yes, there are quite a lot of them, but ISS is by far the brightest. The other satellites can be visible with magnitude fainter than 3. "Can be" means in dusk/dawn, when the satellite is in the sunlight.

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Iridium flashes can be pretty bright even in the daytime. – Rory Alsop Mar 26 '14 at 22:44

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