What orbital timeframe is mentioned for staying aloft at the 100 km boundary?
Answer
Circling the Earth in about 90 minutes
One practical benchmark used to illustrate the physical reality at the 100-kilometer mark involves orbital mechanics. At this altitude, the required speed necessary to maintain altitude equates to a velocity that would necessitate the vehicle to continuously circle the Earth approximately every 90 minutes to avoid falling back down due to gravity. This requirement—achieving a near-orbital period just to stay up—serves as a clear engineering benchmark separating the performance envelope of atmospheric aircraft from that of spacecraft.
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