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

Travelling In A Straight Line In Space

  1. Aug 13, 2009 #1
    I know all object in space have orbits and orbits can be changed but is it possible for rocket or a spacecraft to travel in a straight line.
  2. jcsd
  3. Aug 13, 2009 #2


    User Avatar
    Science Advisor
    Homework Helper

    Hi Sammyg! :smile:

    If it keeps firing its rockets, then it can follow any curve it likes, including a straight line.

    but once the rockets are off, it can only travel in a straight line if it's going "straight up or down". :wink:
  4. Nov 3, 2009 #3
    Travel straight with respect to what?
  5. Nov 4, 2009 #4
    In general rel, there may not be such a thing as a straight line in a spacetime with a funny geometry. When not under the action of external forces, things travel along geodesics. In flat "minkowski" spacetime, this principle corresponds to straight lines and is simply a more general form of the principle of inertia.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook