How long should a satellite last: five years, ten years, 15, 30?

Satellite manufacturers and operators attending the Space Tech Expo here offered contrasting views on how long satellites should continue to work in orbit. For years, government and commercial operators sought to extend the life of satellites by sending them into orbit with plenty of fuel and components designed to withstand 15 years of harsh radiation. Now, the market is diversifying. Customers want everything from cubesats built for six-month missions to geostationary communications satellites designed to last decades. More

(Source: SpaceNews - May 25)