Why do they have a Snellen eye chart on the ISS?

8yr ⋅

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Is this really the logo of the North Korean space program?

8yr ⋅

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What is the reason for the Ariane 5 launcher with Intelsat 29e losing altitude?

8yr ⋅

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Shape of an orbit inside a planet

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A more accurate way of solar sail calculation?

9yr ⋅

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