comet pons-brooks close passage to m33 galaxy

comet ponsbrooks m33 galaxy close passage starry night sky celestial bodies astronomical events stars space exploration cosmos universe astrophotography deep interstellar travel planetary motion orbital paths trajectory galactic neighborhood asteroid belt kuiper oort cloud solar system formation cosmic evolution stellar nurseries gas and dust nebulae supernovae black holes gravitational waves dark matter energy expansion of the big bang theory cosmological principles phenomena mechanics