Constants/properties of a very small-scale and compact universe that is still recognisably like our own (and is it possible)
EDIT: Thanks for all of the answers guys, both answers below were great but I don't know which one to upvote (they both seem equally valid) so it will probably be decided by this next question (the question is to try and narrow down my scope of what is realistic from a hypothetical standpoint). Not to much of a surprise, it turns out that there are many flaws with my supposed universe as you guys have pointed out. Now here's my perhaps better worded question: Is it possible to tweak the gravitational constant and the "starting amount" of matter so that:
* My universe has 1-5 galaxies
* There are a few thousand stars per galaxy (a solution with an order of magnitude more or less stars is fine)
* The orbit sizes relative to the sizes of the bodies of mass involved are at least 5 times smaller
* A planet like our own (preferably with tectonics aka. crust, mantle and core) that orbits a star and has 0.8 to 1.3G is 500-2000km (range is for a bit of flexibility although I don't mind going under 500km that much) in diameter and is able to be created by natural processes in the first place
I understand that my criteria for the universe is very tight and may not have a solution at all but I would prefer to keep the universe as tight, compact and generally small-scale as possible and any insights would be great to creating a more realistic vision of my universe before starting to actually design layout/properties of planets, stars, solar-systems, etc.
Note: Using tidal forces as a sort of substitute to tectonics for generating volcanos and earthquakes (and thus creating a more messy form of the geological and hyrdological cycle although I'm not sure if it would work that way for a close moon or something of the like) is fine by me.
Thanks for all of the help (for the giant amount of help I got prior to this and for any help in advance)! ^_^ 710