‘Pythagoras’ is related to ‘Geometry’ in the same way as ‘Kepler’ is related to '.........''

Astronomy

‘Pythagoras’ is related to ‘Geometry’ in the same way as ‘Kepler’ is related to '.........''

The logic followed here is:

‘Pythagoras’ discovered the ‘Pythagoras’ theorem in geometry

Similarly

‘Kepler’ is German astronomer hence astronomy is right answer