Talk:Gem Homeworld/@comment-27987824-20160616193436/@comment-31509668-20170626082959

@Mr Hellhound

It is true that our local group is held together by gravity. It is also true that the entire universe is held together by gravity. The expansion of the universe is uniform with objects increasing in speed the further out they are from the point of observation. However nothing in this universe is moving faster than the speed of light. Nothing in this universe can move faster than the speed of light. We know from the red shift exactly how fast the rest of the universe is receding from Earth.

Also, our local group, like all other galactic groups, is expanding, not contracting. While is true that Andromeda and the Milky Way are on a collision course, the two galaxies will simply pass through each other with gravity disrupting the spiral shape of each galaxy. Andromeda and the Milky Way will not be combining into a super galaxy. On the whole the galaxies composing our universe are getting further apart.

I don't know what technology gems have that make intergalactic travel so easy for them but there is nothing in the physics of this universe to prevent them from expanding into every galaxy in the universe. The only thing that would restrain them is another intergalactic race of equal or greater power.