Unless space debris is actively tackled, some satellite orbits will become extremely hazardous over the next 200 years, a new study suggests.

BBC: Space debris collisions expected to rise

Satellite and space expert Dr Stuart Eves stressed the large uncertainties involved in tracking the "decay" of satellite orbits (their slow fall back into the Earth's atmosphere).

BBC: Nasa refines satellite crash time

That means that the same spot on the Earth being observed will have consistent lighting as the satellite orbits the Earth, making it easier to see changes over time.

FORBES: Arianespace To Launch Vietnamese Satellite

For 145 years, ITU has coordinated the shared global use of the radio spectrum, promoted international cooperation in assigning satellite orbits, worked to improve telecommunication infrastructure in the developing world, established the worldwide standards that foster seamless interconnection of a vast range of communications systems and addressed the global challenges of our times, such as mitigating the impact of natural disasters and climate change and strengthening cybersecurity.

UNESCO: Post-Conflict and Post-Disaster Responses

Europa, a satellite of Jupiter, and Enceladus, which orbits Saturn, both have large volumes of liquid water buried beneath their icy crusts.

BBC: Drill reaches Antarctica's under-ice Lake Whillans

These modifications will enable the vehicle to better optimize its payload capacity for heavier, more lucrative satellite customers - and also to offer a broader range of orbits to those clients.

BBC: Ariane rocket ready to do battle