[dandruffius]

Just lile the title says, and if they co-exist with our dimension in a way that they affect eachother

[anon1403]

With my limited understanding of dimensions, it is absolutely possible for there to be multiple dimensions

whether they affect our dimension is a bit unclear to me, I personally like the "stickman on paper with a circle" explanation

[Otters4All]

I mean, time is a dimension...sorta.