http://hyperphysics.phy-astr.gsu.edu/hbase/Astro/fried.html#c2 http://hyperphysics.phy-astr.gsu.edu/hbase/Astro/fried.html#... > What’s important is that this

http://hyperphysics.phy-astr.gsu.edu/hbase/Astro/fried.html#c2 http://hyperphysics.phy-astr.gsu.edu/hbase/Astro/fried.html#... > What’s important is that this variable increases in value over time, meaning it must have been smaller in the past. No? The point of the variable is to (basically, meaning it's so tightly correlated it might as well mean it can...) describe expansion rate of the universe. It must have been larger in the past given a big-bang origin model is used.