The orbital relay that made our global village possible

Nature · Published 8 October 2026 Swipe more like this →

In short: Before the 1960s, long-distance communication was a slow, unreliable struggle against geography. Today, we take instant global connectivity for granted, but it relies on a delicate balance of orbital mechanics and high-reliability engineering that allows signals to leap across oceans in an instant.

Before the era of modern satellites, connecting distant continents relied on undersea telegraph cables or shortwave radio. Shortwave technology was often unreliable because it required signals to bounce off the Earth's atmosphere. While these methods allowed for some intercontinental contact, they were limited in range, quality, and speed, leaving vast portions of the world—particularly across oceans—isolated from real-time information.

The shift began in 1958 with the SCORE satellite, used by President Dwight D. Eisenhower to broadcast a Christmas message. This mission proved that a satellite could receive a signal from one location and immediately retransmit it to another, or even store it on an onboard recorder for later transmission. By the mid-1960s, these capabilities became reliable enough to blanket the globe, enabling television to reach hundreds of millions of people simultaneously and making the phrase 'live via satellite' a household staple.

Maintaining this connection requires overcoming a hostile environment. Satellites must survive launch accelerations reaching 28,100 km (17,500 miles) per hour and endure extreme temperatures and radiation for up to 20 years. Because launch costs are weight-dependent, they must be built from lightweight, durable materials while maintaining a reliability rate of over 99.9 percent without the possibility of repair.

To stay in position, satellites use propulsion systems for 'station keeping' and 'attitude control.' Because the gravitational pull of the Moon and Sun can cause a geostationary satellite to deviate by up to a degree every year, thrusters must fire occasionally to correct their path. A satellite's operational life is ultimately dictated by its fuel supply; once exhausted, it drifts into space as debris.

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