Borosilicate marble, lampworked on a torch.
This is basically a vortex marble, with even more detail. The center photos show the side view where you can see galaxies receding into the distance.
1 9/16" diameter
Boise Art Glass Galaxy Marble #2
Filip Vogelpohl makes his home in Idaho (Boise, of course). He works in borosilicate and furnace blown glass.