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B 3rd cosmic velocity

  1. Mar 13, 2018 #1


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  2. jcsd
  3. Mar 13, 2018 #2


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    The cosmic velocities are dependent on position in the gravity well. The 42 km/s is the escape velocity in the Sun's gravity well at the distance of Earth's orbit. It's much lower where the Voyagers are currently.

    There's a nice graph of Voyager 2's velocity vs escape velocity on its Wikipedia page:
    The spikes are flyby manoeuvres.
  4. Mar 15, 2018 #3


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