Because I can't comprehend how that experience would be I guess!

I dream about floating in space a lot, I would say nearly half of my lucid dreams involves space of some kind. I see planets and I just want to go visit them! But the sheer size of space is something I cannot comprehend. The planets just turn into large beach ball things I cannot go visit, I end up just bumping into them as if they weren't planets at all. I've tried falling into earth several times but I end up just falling into nothing because I don't have an understanding of objects that are so big!

Anyone have any tips/ baby-steps I could take to eventually land on these mysterious planets?