Order of Magnitude Analysis

Only slightly less useful than real analysis, order of magnitude analysis (instead of using actual values) only considers what size "ruler" one would choose to measure each thing then compares those "ruler" sizes to assertain whether thing one is huge compared to thing two or vice versa.

By order of magnitude analysis, the scale of an atom is a 1 billion-billion-billion-billionth the scale of the observable universe. So, quite frankly my dear, we astrophysicists don't give a damn!