Can someone explain why this game is so terrifying?

Just zooming into a planet too fast scares the f**k out of me. Let alone any explosions coming towards you. I can't imagine playing this on VR.

Many people online expressed a similar fear to this and I'm so curious as to why this brings out a deep fear in us? It's the scale concept of the planets? It's it the nothingness of space? Too immersive that it makes us comfortable?