how to research uranium processing?

[premier69]

in the new space age to be specific the research button is greyed out and everything previous in the tech tree is marked "green" as in research completed.

[knighttemplar1960]

Mine enough uranium ore to unlock uranium processing.

[Hurkyl]

You can mouse over the research requirements on a technology to get a description.

[IEATFETI]

if you read it tells you what you need in order to advance