According to the United Nations Space Department, the number of artificial satellites (including spacecraft such as the ISS transport aircraft) launched in various countries around the world has exceeded 7,600 as of February 2017, and those recovered on the ground and those that have been recovered on the ground.There are more than 4,400 satellites in orbit, excluding those that have fallen in altitude. In addition to rocket aircraft and artificial satellites such as apogee motors, space debris continues to orbit the earth, and those with a diameter of 10 cm or more are monitored by radar from the ground. As you can see from this image, there are so much…