Since the present idea is that the known Universe (include dark matter) was once condensed into a tiny singularity; and since this 'exploded' into what we now see, how can we measure time of events? Or describe how 'large' the Universe was at any point in time? In other words, I'll read something that says: How can we assess the Univers's length? To what are we measuring it against? Isn't space relative? I'll also read: Now how can the universe be 500,000 years old? Aren't events occurring at different rates at this earlier time relative to our 13 billion year time-frame? I'd think the condensed nature of the Universe at that time would make a standard of time to judge by a meaningless concept. How can we say the Universe was the size of a pin head at 10^15 Plank Time? How big is a pinhead when the Universe itself is the size of a pin head? Using these dimensions (space and time; two solar systems and pin heads) seems painfully inadequate, yet I read about them all the time!