Googolplexes, infinity and beyond...

I've had to come upstairs to bed to rest my head. I'd just enjoyed an episode of America's Next Top Model (don't judge me!) and then to instil a sense of balance into my viewing, I started watching the Horizon documentary which explored the troubling concept of infinity. I lasted ten minutes and then fled from the television, chased away by the mindblowing horror of a googolplex. My head is seriously woolly from being at a critical appraisal course all day - I am dazed by confidence intervals, P-values and absolute risk ratios and the googolplex has sent me over the edge. How can a number be too big to be written out because there isn't enough space in the universe?? *cries*