Science and Religion in Fiction book club: Greg Egan "Clockwork Rocket"

From amazon.com:

"Set in another universe where light does not travel at a constant speed but instead has a velocity that depends on its wavelength, Clockwork Rocket recounts the personal life journey of an inhabitant in this fictional universe."

"Alongside a taut and well imagined story set in a very alien world - complete with a sympathetic range of characters and a well imagined society - Greg Egan develops an entire alternative physics. This isn't just done in a hand waving way, it is properly worked out. The story of Yalda, the scientist who is the main protagonist, is also the story of the discovery of "rotational physics" in her universe, of the implications of that, good and bad, for her planet, and finally - in the construction of the rocket of the title - the story of the action she takes to safeguard that world."