1. Because all the pressure and heat clamped the debris and minerals together forming planets. Today the universe is growing by getting the minerals broken from small and large rocks that break apart or clash into each other.

2.I think if stepped foot or got pull into a black hole it would take me through a whirlpool of time and space and i would end up in a whole different time or universe. I would be lost in time forever left to find new places to live or create new worlds.

3. I think if you step into a worm hole you would travel either back or further in time what ever one needed fixing or just fr you to simply observe would happen ed that you might of forgotten about in your past.