The baryon asymmetry problem in astrophysics refers to the apparent fact that the baryons in the universe which have been observed are overwhelmingly matter as opposed to anti-matter. Neither the standard model of particle physics, nor the theory of general relativity provide an obvious explanation for why this should be so. There are competing theories to explain this part of the phenomena of baryogenesis, but there is no one consensus theory to explain this phenomena at this time. Spiral Galaxy ESO 269-57 Astrophysics is the branch of astronomy that deals with the physics of the universe, including the physical properties (luminosity, density, temperature and chemical composition) of astronomical objects such as stars, galaxies, and the interstellar medium, as well as their interactions. ... In particle physics, the baryons are a family of subatomic particles including the proton and the neutron (collectively called nucleons), as well as a number of unstable, heavier particles (called hyperons). ... Matter is the substance of which a physical object is composed. ... Antimatter is matter that is composed of the antiparticles of those that constitute normal matter. ... The Standard Model of Fundamental Particles and Interactions The Standard Model of particle physics is a theory which describes the strong, weak, and electromagnetic fundamental forces, as well as the fundamental particles that make up all matter. ... Particles explode from the collision point of two relativistic velocity (100 GeV) gold ions in the STAR detector of the Relativistic Heavy Ion Collider. ... Two-dimensional visualisation of space-time distortion. ... Baryogenesis is the generic designation for the physical processes that generate matter (more specifically, a class of fundamental particle called baryon) from an otherwise matter-empty state (such as it is generally believed to be the state of the Universe at its onset, the so-called Big Bang). ...