Satellite network & communication services cover practically many important sectors and any interference with them could have a serious effect. They are a strategic asset for every country and are considered as critical infrastructure , they are considerable as privileged targets for cyber attack. In this High professional Book with 200 references we discusses the Satellite Communications architecture operation design and technologies Vulnerabilities & Possible attacks .Satellites Network Needs More funding in Security It's important to increase the cost of satellite network security . The correct investing in satellite network security depends on the risk value . vulnerabilities can be exploited through Internet-connected computer networks by hackers or through electronic warfare methodologies which is more directly manipulate the radio waves of uplinks and downlinks. in addition to all of that we provide recommendations and Best Policies in Practice to protect theSatellite Sky communications and network. You will find the most about : satellite communication security Network architecture security, applications ,operation , frequencies, design and technologies satellite communication threats Commercial Satellites Attack Scenarios Against Cobham BGAN Terminals Downlink Jamming attacking BGAN Terminals / GRE /Marine /cobham AVIATOR ,VAST and FB Terminals How to protect security issuse in space network satellite Encryption harding , Vulnerable Software satellite DDos , hijacking , jamming and eavesdropping attacks security issuse in space network