system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU]: Are the "realms" that asgardians are able to travel too simply other planets? Or are they traveling to different universes.

Asgard seems to be regarded as somehow special because they are able to travel to different realms. But if they're technology only let's them travel to a limited number of planets then aren't they not all that great in comparison to other space faring races?

The collector in guardians of the galaxy said that each infinity stone was a product of a big bang. This would seem to lend to the fact that there is more than one universe in the MCU. Are the asguaridans special for their ability to traverse the different universes? 

Also in Thor 2 when they were waiting for the "realms" to align.  Wouldn't they have just said planets if all they were talking about were planet's orbits? It would make more sense if they were talking about the universes aligning in the space outside space-time that they exist in. That would make the event much more special.
gpt
In the comics all 9 realms are different dimensions, in MCU i think they are only different parts of space, connected by yggdrasil, which make travel instant, rather then very long, even with ftl. The infinity stones are not a product from a big bang each, they are from before the big bang. It was a great being, that split itself into six parts, the stones. And when the realms would align, i think that it was more that yggdrasils different parts would align, and create all the whacky portals we saw.