**Acknowledgements**

The authors would like to express special thanks to TUBITAK Space Technologies Research Institute (TUBITAK UZAY), National Aeronautics and Space Administration (NASA), Japan Aerospace Exploration Agency (JAXA), The Institute of Electrical and Electronics Engineers (IEEE) and the European Association on Antennas and Propagation (EurAAP) for permissions of some specific photographs and figures to use in this chapter. The authors also thank to Dr. Aslı ER AKAN for editing and redrawing figures within the text.
