Maths and Physics > 100 billion

Do you ever find yourself wanting to say something profound about the size of the universe, only to realise you can't remember the numbers? Well, you need only remember one:

100 billion stars per galaxy, 100 billion galaxies, 100 billion light years across. The observable universe, roughly.

That should hopefully make it easier to remember, you can store it somewhere amongst the 100 billion neurons in your brain.