The planets of the Solar System rotate around the sun on a plane. When we send research vehicles to these planets, communication with them is only possible if there is direct line of sight. When the vehicle is on the other side of the Sun communication is interrupted. Depending on the periodicity of the orbit of the vehicle these dead times can be months or years. Therefore we need relay communication satellites rotating around the sun that enables Earth link between anywhere on our Solar System at anytime.
Earth's orbit is the path in which the Earth travels around the Sun. Earth lies at an average distance of 150 million kilometers from the Sun and Earth travels 940 million kilometers around the Sun. That is a challenging task. Astrophysicists need to come up with solutions that even the farthest satellite could be launched with the current space rockets. Finally the Solar Surrounder Satellite Network should be complementing the planetary Low Orbit relays for every planet and moon we plan to explore.
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