In this paper, a simple computer simulation inspired by NASA’s DART mission was developed, which explores the possibility of deflecting an asteroid from its path to a collision with the Earth. The Earth is showered by small meteors every day, but it is a statistical necessity that every now and then a larger asteroid appears and threatens our planet. Thousands of asteroids live in the immediate vicinity of the Earth, and as many as 1,400 of them have been identified as potentially dangerous for the Earth. The researched method of planetary defense is shooting the asteroid with a spacecraft sent from Earth so that the asteroid is diverted from its path by simple transfer of momentum and in that way avoids a collision with the Earth. The technology used to develop the simulation is the Python programming language and its well-known numerical library NumPy, while Matplotlib is used to visualize the results. In conclusion it is found that even a simple computer simulation such as this one shows potential for this kind of method of planetary defense and has perspective for success. On the other hand, in order to develop a more serious simulation, the numerical methods used, the power and speed of calculation should be significantly improved.