%0 Journal Article %T Relativistic Motion with Viscosity. I Newton¡¯s Law of Resistance %A Lorenzo Zaninetti %J International Journal of Astronomy and Astrophysics %P 435-444 %@ 2161-4725 %D 2021 %I Scientific Research Publishing %R 10.4236/ijaa.2021.113021 %X The equation of motion for a relativistic neutral particle that moves in a medium characterized by a friction proportional to the square of the velocity is analyzed. The relativistic trajectory is derived in a numerical way and in the form of a Taylor series. The astrophysical applications cover the trajectory of SN 1993J and the light curve of gamma ray bursts. %K Supernovae %K General %K Supernovae %K (Individual: SN1993j) %K Gamma-Ray Burst %K (Individual: GRB 130427A) %K Gamma-Ray Burst %K (Individual: GRB 060729) %U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=112117