metaphysics: the branch of philosophy that deals with the first principles of things, including abstract concepts such as being, knowing, substance, cause, identity, time, and space.
astrophysics: the branch of astronomy concerned with the physical nature of stars and other celestial bodies, and the application of the laws and theories of physics to the interpretation of astronomical observations.
Much of the nature of the cosmos is indeed a mystery, but that doesn't diminish the importance of the multitude of things we've learned about our universe from various physical observations and measurements.
astrophysics: the branch of astronomy concerned with the physical nature of stars and other celestial bodies, and the application of the laws and theories of physics to the interpretation of astronomical observations.
Much of the nature of the cosmos is indeed a mystery, but that doesn't diminish the importance of the multitude of things we've learned about our universe from various physical observations and measurements.