Called Auroral Kilometric Radiation (AKR), the noise is generated by the same shaft of solar particles that produces an aurora in the atmosphere below.
With the development of advanced aerobiology and aerodynamics , the aeroboat would be popular and people would research the mystery of the space's aeon .
On condition that the front body shape of the projectile is unchangeable,a formula is obtained for determining the relation between the optimum boattail angle and the supersonic flight region.