| 21. | :Note that real-life space launches achieve orbital velocity of about 5 miles / second without killing the passengers.
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| 22. | Despite of this, it takes about 1.9 years, corresponding to slow orbital velocity of 14.82 km / s.
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| 23. | :v _ { \ infty } \, is the orbital velocity when the orbital distance tends to infinity.
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| 24. | The required speed is called " orbital velocity, " and it varies with the height of the orbit.
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| 25. | The comet weighs 1 kg, give or take, and has a maximum orbital velocity 38 km / s.
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| 26. | Since the engine could not produce sufficient thrust to achieve orbital velocity, the mission had to be aborted.
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| 27. | Eventually the satellite comes around to point D where Earth's gravity is now reducing the satellite's orbital velocity.
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| 28. | In these systems, the separation between the stars is usually very small, and the orbital velocity very high.
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| 29. | It eventually reaches an altitude where it must fly so fast to generate lift that it reaches orbital velocity.
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| 30. | Martian air can also be used for aerobraking to orbital velocity ( aerocapture ), rather than descent and landing.
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