[en] On the basis of current theoretical understanding of star cluster formation and observational evidence of disk-shaped nebulae around young stars, it is shown that the possibility of binary star formation vivia tidal interaction of such nebulae during close stellar encounters should be investigated. Such an investigation was carried out via computer models of parabolic encounters with each star surrounded by dynamically supported disk nebulae of mass equal to the stars'. Other trials were also run with a more conservative nebular mass of 0.1 that of the stars'. The computer model used can only handle two-dimensional configurations with the disk planes in the encounter orbit plane. Also valid results could be gathered only for limited amounts of tidal disruption of the nebulae. The model used a technique of calculating the gravitational field of a continuous disk that was recently proposed by Clutton-Brock. The computer model is also valid for showing what will happen during tidal encounters of galaxies, taking into account mass in the galactic disks. The model demonstrates that binary galaxies will form during parabolic encounters with disk collision, mass interchange, and high speed ejection of material occurring in the closer encounters. The success of the model in accounting for the observed characteristics of binary galaxies is presented. (U.S.)