- TODAY'S FACT
- January 21, 2026
- TODAY'S FACT
- January 21, 2026
On the International Space Station's altitude (~400 km), Earth's gravity is still about 90% of surface gravity. Astronauts float because they're in continuous free fall while orbiting the Earth at about 17,000 mph (roughly 27,600 km/h) - not because of zero gravity.
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