MadSci Network: Astronomy
Query:

Re: Does our universe move in a forward motion?

Date: Sun Dec 10 20:08:53 2000
Posted By: Steven Furlanetto, Grad student, Astronomy, Harvard-Smithsonian Center for Astrophysics
Area of science: Astronomy
ID: 976292433.As
Message:

The short answer is no, the universe doesn't move.  This is because the 
"universe" is defined to be all of space...so there is nothing for the 
"universe" to move through!

However, not only does the earth revolve around the sun, but the sun revolves 
around the center of the Milky Way galaxy (with an orbital period of 200 million 
years or so), and the Milky Way galaxy is being pulled into a larger group of 
galaxies called the Virgo Cluster, and the Virgo Cluster is being attracted to 
an even larger group of galaxies, and so on.  So, although the universe as a 
whole doesn't move, because it can't by definition, every part of the universe 
does move within it.


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