Why are there certain physics principals fundamental to understanding....?

...that aren't taught anything like early enough. Such as why the big bang can be observed in all directions, why the colours of visible light appear to form a circular not a linear sequence, why space co-ordinates are impossible, and why stars can exist in a vacuum. These questions perplexed me for years and no-one would provide suitable answers until just recently. And I've been living under the false pretence that the universe is a place of solid objects with physical contact, not phantom particles that are simply repelled!