Into The Cosmos is a mod I am currently developing... I am planning on adding a whole bunch of stuff to this mod.
Currently there are 10 places to go to via portal igniters which can be accessed in the creative menu under tools & utility.
A portal can be crafted by using the crust of whatever planet you want to go to.
Crust blocks are the surface blocks of each planet.
Currently this is the only way to get it this is currently just to get peoples opinion of the mod so far.
If you are experiencing visual glitches... I am sorry. world renderer is a pain to work and its buggy... if I add one element to the mod, the dimensions start to break.
There is a GUI tester block mainly for testing the tier 1 rocket screen which does allow you to switch from earth to the moon.