Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

B 3rd cosmic velocity

  1. Mar 13, 2018 #1

    fresh_42

    User Avatar
    2017 Award

    Staff: Mentor

  2. jcsd
  3. Mar 13, 2018 #2

    Bandersnatch

    User Avatar
    Science Advisor

    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:
    512px-Voyager_2_velocity_vs_distance_from_sun.svg.png
    The spikes are flyby manoeuvres.
     
  4. Mar 15, 2018 #3

    tony873004

    User Avatar
    Science Advisor
    Gold Member

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted