I am working on a Young Adult fictional story that is based upon the ability for humans to travel through portals. I have done a little research about portals, an idea that has always been interesting to me. In my understanding, portals are proven to be, according to NASA, pathways linking earth magnetic field to the suns. Wormholes, however, are theorized to be shortcuts through spacetime.
In my story, I am developing it so that portals are on the earth and can transport objects to other Alternate Earth realms (which are essentially another dimension), that can be either similar or dramatically different than ours. The fictional portals are in many different areas of the planet, open and close on unique patterns, and couldn't be observed through the naked eye of an average person.
Any recommendations on how I can use solid scientific proven information and theories to support my idea? It doesn't need to be too complex, but enough to make sense to a curious, sci-fi loving, young adult reader. Thanks in advance.