In this paper, we study the gravitational field generated by a material straight line around itself. We show the simplicity of the studied field, and we show its relation with the arc of half circle. We discussed also the subject of attracting two spacious straight lines, and we show the absence of relation between the mutual force and the distance. Also we study the field generated by a ray, where we present the different formulas for this field, and we show its geometrics properties, and its relation to a circular arc sees through it. Also studied the previous field lines, and we show that it are parabolas, and we appear by different ways that the equivalent surfaces are parabolic surfaces of revolution.