ASTRONAUGHTY

Space begins about 100 kilometers above sea level—the Kármán line. The official “you’re not on Earth anymore” marker.

✓ TRUE FACT
The Kármán line is a commonly used boundary at ~100 km, where aerodynamic flight becomes impractical and orbital dynamics dominate. Some definitions use 80 km, but 100 km is the classic benchmark.

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Space begins about 100 kilometers above sea level—the Kármán line. The official “you’re not on Earth anymore” marker. | SmartAss Facts