11) Any idea of how to resolve the issue of space debris? How to clean up the space from the junk?

12) Name at least two types of handover in non-GEO satellite networks.

13) In the GPS system what is the minimum number of satellites that the receiver needs to be communicating with to determine position (latitude, longitude and height) as well as time? 14) Calculate the round-trip time delay for a satellite in LEO, or 300 Km average distance.

15) Satellite diversity is used in order to reduce the probability of satellite .....

16) Name several major challenges that need to be made and overcome in future space exploration