Philosophy is NOT a science as it just is abstract thought and 'logical' manipulation of concepts that may have no basis in physical reality. Economics is somewhat the same. How many angels can dance on the end of a pin comes to mind. It is useful though for exploring the unknown unknowns to figure out how to scientifically explore them.
Physics of course is not philosophy as it uses real world evidence or data to test hypotheses that can later be formalised as a theory for further testing and refinement. Internal logical consistency to all the current known laws of physics is also paramount. Resorting to 'magic' as an explanation does not cut it. The 'invisible hand' in economics is a magical force.
That is why Einstein baulked at the very real 'spooky' instant action at a distance of quantum entanglement. We just do not understand quantum mechanics fully. We have missed something. This is why we cannot tie quantum theory with space time gravity. To understand black holes would need this as gravity is acting at the very small where quantum effects usually fully describe what is going on.
Dark matter and dark energy are real. We just do not know what they both are yet.
Here is a good introduction
http://www.youtube.com/watch?v=-VmXZn702v0
Bert