Are galaxies on the move, and if so, in which direction and at what speed?

20 Answers

  • 2 months ago

    YES!!  Galaxies are moving and also rotating. As we observe them from Earth they all appear to be moving away from each other  and the Earth; 'red shift' effect . Thought to be as a result of the 'Big Bang'. 

  • 2 months ago

    yes and northward , speed slow, but then there a few million years away .

  • Anonymous
    2 months ago

    They are expanding from a singular point which we call the Big Bang.  Google for the rest of the information.

  • 2 months ago

    They do move... here's a link that shows how our local group of galaxies is moving in relation to others - right now, they're 'falling' toward the Virgo supercluster:

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  • 2 months ago

    Galaxies are moving away from each other and in this region of space moving in the direction of Virgo.

  • neb
    Lv 7
    2 months ago

    The only definition of speed and direction of galaxies that makes universal sense at cosmological scales is the speed and direction of galaxies with respect to the CMBR (cosmic microwave background radiation). The CMBR serves as a cosmological ‘rest’ frame by which motion anywhere in the universe can be measured with respect to a common inertial reference frame. The CMBR is the frame comoving with the expansion of the universe.

    Here’s how it works. If you measure the CMBR temperature to be exactly equal in EVERY direction, you are not moving with respect to the CMBR rest frame.

    If you measure a blue shift of the CMBR in a particular direction, you are moving in that direction with a speed that depends on the amount of blueshift. For instance, the earth is moving about 400 km/sec with respect to the CMBR frame which isn’t particularly fast.

    So, no matter where you are in the universe, you can always measure speed and direction against a common reference frame that everyone else in the universe uses. 

  • 2 months ago

    Besides what others answer, (local group motions, expansion of the universe) there is much more.

    The Local Group containing the Milky Way is part of a much larger cluster,  the Virgo, named for the constellation part of the sky where it appears.  Thousands of galaxies are in it.

    A step larger in complexity is the giant web of clusters, with many strings of gas and dust between them.  This web has huge empty spaces or voids, where very few galaxies are, and few if any web strings cross.  We don't know yet how stable this web is, but it seems to be billions of years old.

    The whole mass, a huge stringy collection of millions of galaxies and great masses of gas and dust is moving toward an unknown destination at great speed of millions of miles per hour.  This spot is called "The Great Attractor".  No one knows what it is, not seen yet.

  • 2 months ago

    In every Direction and at all Velocities Relatively

  • Anonymous
    2 months ago

    they are trying to get as far away from us as possible.

  • 2 months ago

    OK let's do some modeling.

    Think of our global universe, the one we're in, as a partially inflated balloon.  Now paint (in your head you don't actually need to do it) little white dots all over the surface of the balloon.  Those dots are the billions of galaxies in our universe.

    Now blow the balloon up bigger but slowly so that you can watch those dots.

    They are getting farther and farther apart from each other as the balloon expands.

    And that's approximately what happens to the real galaxies as the universe, yes the space.time of the real universe expands.  So in this one case, the galaxies are all moving away from each other because the space between them is expanding.  And the speed at which they are separating depends on how old their section of the universe is.

    And a gent named Hubble [See source.] also found that the older the universe the faster is its expansion so as the universe ages the galaxies are accelerating away from each other.  There are ancient volumes of space.time where space is expanding faster than light speed.  

    And yes, space can travel faster than the speed of light because it has no inertia.  The current guesstimate as to the expansion and galaxy recession speed is 72 km/sec/3.3 million lights years from the Earth.  As you can imagine there is a distance from Earth where the speed reaches and exceeds 300,000 km/sec, the speed of light.

    That's one case of motion.  In another case each galaxy has its own motion relative to other galaxies.  Andromeda for example is moving at 110 km/sec straight for our Milky Way galaxy.  So in the far future the one will crash into the other.  Other galaxies are doing their own things too.  Moving about with their own motion relative to other galaxies at various velocities.

    Source(s): The dominant motion in the universe is the smooth expansion known as Hubble's Law. In 1929, Hubble estimated the value of the expansion factor, now called the Hubble constant, to be about 500 km/sec/Mpc. Today the value is still rather uncertain, but is generally believed to be in the range of 45-90 km/sec/Mpc. Hubble's Law - Home Cornell Astronomy
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