Astroparticle physics, also known as particle astrophysics, is a branch of natural philosophy that studies elementary particles of astronomical origin and their relation to Astrophysics, Cosmic ray physics, astronomy, Cosmology and Particle physics. It is quite a new field arising at the interaction of particle physics, astronomy, astrophysics, detector physics, relativity, solid state physics, and cosmology. Partly driven by the invention of neutrino oscillation, the field has undergone fast development, both in theory and experiments. The field of astroparticle physics has developed from the field of Optical physics. The detector technology has advanced the field of astrophysics which involved topics, like mechanics, electrodynamics, thermodynamics, plasma physics, nuclear physics, relativity, and particle physics. Particle physicists found astrophysics necessary due to difficulty in producing particles with comparable energy to those found in space. Astrophysics and aerospace Technology (JAAT) is an Open Access journal includes a wide range of fields in its discipline.