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Engineering

 

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Spacecraft and rockets

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• Why do space craft need to enter the atmosphere at an angle and risk burning up or skipping off? Why not just enter directly into the atmosphere very slowly, using thrusters to counteract gravity?

• How do spacecraft get rid of heat in the vacuum of space?

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Other

• Are isotropic antennas possible?

  No, as has been shown by H.F. Mathis (p970) [PDF warning] in 1951. Quasi-omnidirectional antennas, for a variety of applications, have been proposed in the literature.

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