Satellite mega-constellations form the backbone of global connectivity in the vast expanse of space. However, the hostile space environment poses continuous challenges to these networks. High-energy particles from the Sun, cosmic rays, and trapped particles in the Van Allen belts can induce single event upsets, flipping bits, and disrupting satellite internal operations. Space debris also presents a serious threat, capable of destroying satellites in an instant. At the same time, intense sunlight can overwhelm satellite sensors or blind inter-satellite connections, leading to communication failures across the constellation. This new frontier of satellite networking "in the hostile space environment" is thus defined by the challenges of the space environment. Addressing these challenges requires satellites to operate as a coordinated and resilient constellation, ensuring that the global network continues to deliver reliable communication despite frequent disruptions.