Opening up a realm - wormholes:

Wormholes - an opening of portals in space that leads to another part of the Universe

Each wormhole opening is an opening to a new realm - a new house, a new part of the Universe.

Each realm may contain up to an infinite number of galaxies, up to which for the leaders of the planet, their limit is 10 Billion galaxies per realm.

What is a galaxy?  A galaxy is a solar system consisting of 9 planets such as mercury, venus, earth, mars, jupiter, saturn, neptune, and pluto, plus the moon and the sun, and the stars.

photo credits:  google images.  keyword:  star trek deep space nine opening up a portal in space