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

Solar System

  1. Mar 20, 2010 #1
    I know that the earth rotates around the sun, but what does our solar system rotate around?

    P.S. I'm a noob when it comes to anything related to astronomy, sorry.
  2. jcsd
  3. Mar 20, 2010 #2


    User Avatar
    Science Advisor

    Our solar system rotates around the center of our own Milky Way galaxy. Our galaxy, in turn, moves around according to the gravity of (primarily) our local group of galaxies, of which Andromeda is the primary contributor (not exactly an orbit, more like we're plunging together). Beyond that, I'm sure our local group has some motion with respect to other clusters of galaxies, but I don't know the specifics of it.

  4. Mar 21, 2010 #3
    Go to You Tube search for "Monty Python Universe Song" that gives all the information you need.
  5. Mar 22, 2010 #4
    Latest data indicates the Milky Way is heavier than M31 (the Andromeda Galaxy), but it's very hard to measure.

    Our local group is also moving in a certain direction with respect to the Cosmic Microwave Background, producing what's called the CMB Dipole. Look it up for exact details of direction and speed, but it's roughly ~600 km/s I think.
  6. Mar 22, 2010 #5
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook