(via Science Asylum) Believe it not, Einstein originally thought the universe was static. It would take Alexander Friedmann to correct him. Here are the Friedmann equations, explained simply.

I'm studying for my Qual (12 days to go and counting), and currently slogging through cosmology. Something that was never explained to my satisfaction earlier is how inflation resolves the fine tuning ...

“The equation is called the Friedmann equation and, simply put, governs the expansion of space in a homogenous universe such as our own. In the 1920s Alexander Friedmann, a Russian astrophysicist, ...