Satellite internet: what it does and does not solve

Low Earth orbit broadband is the first genuinely new consumer connectivity option in years, and its strengths and limits both follow directly from orbital mechanics.

Why low orbit changed things

Traditional satellite internet used geostationary satellites at roughly 36,000 kilometres.

The round trip for a signal at that distance imposes latency of several hundred milliseconds regardless of any engineering improvement. That is fine for streaming and unusable for interactive applications — video calls, gaming, remote desktop, anything with a handshake.

Low orbit at a few hundred kilometres reduces the round trip by two orders of magnitude, bringing latency into a range comparable with terrestrial connections.

That single change is what made satellite internet a substitute for broadband rather than a last resort.

What it costs to achieve

A satellite at low altitude sees a small patch of ground and moves across the sky quickly.

Continuous service therefore requires many satellites, constant handover between them as one passes out of view and another rises, and a phased-array antenna at the customer end that can track electronically without moving.

That antenna is a substantial part of the hardware cost, and it is the reason the terminal is not a cheap dish.

The capacity constraint

The limit that matters most and is least discussed.

A satellite has finite radio spectrum and finite power. The capacity it can deliver is shared among all users within its footprint at that moment.

Which means service quality depends on subscriber density, not on how far you are from anything.

A user in genuinely remote territory, with few others in the same cell, gets excellent service. A user in a dense suburb where many neighbours have subscribed shares the same satellite capacity and sees it degrade.

This is the opposite of the intuition people bring from terrestrial networks, and it is why operators have introduced regional capacity limits and waiting lists in some areas.

It is also why satellite is complementary to fibre rather than competitive with it. Fibre capacity scales by adding equipment at each end; satellite capacity is bounded by spectrum and orbital slots.

Inter-satellite links

An important architectural detail.

Early designs required a satellite to be simultaneously in view of both the user and a ground station, which limited coverage to regions near gateways.

Laser inter-satellite links let traffic route between satellites in orbit, so a user can be served far from any ground station — over oceans, in polar regions, or in territories where a gateway cannot be built.

This substantially expands where the service works and reduces dependence on local infrastructure and, in some cases, on local permission.

The practical limitations

Obstruction. The terminal needs a clear view of a large area of sky. Trees and buildings cause dropouts, and the satellites move, so an obstruction that is harmless at one moment matters at another.

Weather. Heavy rain and snow attenuate the signal at the frequencies used. Snow accumulation on the terminal is a real problem addressed with heaters, which draw power.

Power draw. The terminal consumes meaningfully more than a domestic router, which matters for off-grid installations.

Cost. Hardware plus monthly subscription is typically well above terrestrial broadband where terrestrial broadband exists.

The externalities

Worth stating plainly, because they are genuine and contested.

Astronomy. Bright satellite trails contaminate long-exposure images and, more seriously, radio emissions interfere with radio astronomy in adjacent bands.

Operators have engaged with astronomers and implemented darkening measures with partial success. The problem scales with constellation size.

Orbital congestion. Tens of thousands of satellites in similar altitude bands raises collision risk and the coordination burden between operators.

Atmospheric effects of re-entry. Satellites at these altitudes deorbit and burn up by design. The deposition of vaporised aluminium and other materials in the upper atmosphere is an area of active research with genuine uncertainty.

Who it is actually for

People and organisations with no terrestrial option: rural properties, ships, aircraft, remote industrial sites, disaster response and field research.

For those users it is transformative, and the honest framing is that it fills a gap rather than replacing the ground.

Where fibre exists, fibre wins on capacity, cost and reliability, and it will keep winning. Satellite is what you use when there is no ground to dig.