Constants

There are a set of constants that crop up in science again and again, usually in the explanations for various effects.

Here are a few of them:

C - the speed of light
D - the number of spatial dimensions in our world
Epsilon - the nuclear efficiency
the hubble constant - rate of expanion of the universe, thought to be about 51kps/megaparsec
lambda - cosmic antigravity
N - the strength of the electrical forces holding atoms together divided by the gravity between them
Omega - the ratio of the actual density of the universe to the critical density of the universe
the photoelectric constant - the ratio of planck's constant to the electronic charge
Pi - the ratio of the circumference of a circle to it's diameter
h - Planck's constant
Q - it determines how tightly galaxies and clusters of galaxies are bound together