the major space going nations are working on sophisticated nira radia systems to prevent like collisions gemini's air space center. the d.l.r. is using a missile defense system from the german military in conjunction with the famous found hole for gazelles shaft research group. radar facility outside bone in western germany is the only one in europe that can track and depict of jets in orbit up to 2 centimeters in diameter manuel metz and his colleagues have been conducting precise measurements on space debris in order to prevent the need for a vase of action by active satellites. women and if you have an object that you are especially interested in because it is threatening to combine it with your own satellites then you can use your system to real measure its orbit and obtain more precise data as you can this physical presence that gives you a better risk assessment of whether a collision is actually imminent or whether such a collision can be ruled out and that. there are several collisions every day is a sieve many of us are only needed 2 or 3 times a year. but the scientists models