How Satellite Internet Works: From Space to Your Rooftop

For most of us, the internet arrives through a cable in the ground. But for millions of people — on remote farms, in mountain villages, on ships at sea — there is no cable, and there may never be one. For them, the internet comes from space.

Satellite internet beams broadband down from orbit. It is one of the oldest ideas in communications and, thanks to a new generation of satellites, one of the fastest-changing. Here is how it actually works.

The connectivity gap: why fiber can't reach everywhere

Laying fiber-optic cable is a construction project: trenches dug, permits secured, cables spliced — all for the homes along the route. In a dense city, one trench serves thousands of paying customers and the maths works beautifully. In the countryside, that same trench might serve a dozen homes. Across mountains, deserts, or open ocean, it can cost a fortune to reach almost nobody.

That is the core problem: the economics of cables depend on density. The sparser the people, the worse the business case — which is why remote areas are so often left with slow, outdated connections, or none at all.

Satellites flip the economics. A satellite's signal covers everywhere it can see, whether that is a capital city or an isolated ranch. The cost is mostly in the sky rather than in the ground, so reaching the last remote village costs little more than reaching the first.

Old vs new: geostationary giants and LEO swarms

The old way: geostationary orbit. Traditional internet satellites sit 35,786 kilometres above the equator — so high that they orbit at exactly the speed the Earth rotates, appearing to hover over one spot. From that height a single satellite can see a huge swathe of the planet, so a handful of them cover almost everywhere.

The catch is distance. Your signal must travel up 35,786 km and back down — a round trip of over 70,000 km, plus routing on the ground. That journey takes time: typically 500–600 milliseconds of latency. For email or streaming a film, which buffers ahead, that is fine. For a video call or an online game, where every delay is felt, it is miserable.

The new way: low Earth orbit. The new constellations fly far lower — Starlink's satellites orbit at around 550 km, inside the 500–2,000 km band called low Earth orbit. The round trip is short, so latency drops to roughly 25–60 milliseconds: comparable to decent terrestrial broadband.

The trade-off: from 550 km up, each satellite sees only a small patch of Earth and zooms overhead in minutes. So instead of a few big satellites, you need thousands of small ones, constantly handing your connection from one to the next — like mobile phone masts, but racing across the sky many times faster than any jetliner.

The constellation concept

A constellation is a fleet of satellites working as one network. Instead of a few expensive, bus-sized satellites built to last 15 years, companies now mass-produce small satellites on assembly lines and launch dozens at a time.

Starlink, built by SpaceX, is the giant: around 10,700 working satellites as of mid-2026 — roughly two-thirds of every active satellite in orbit. It is authorised for 12,000 first-generation satellites and has filed for up to 42,000. The network serves more than 6.5 million subscribers across 102 countries.

Rivals are far smaller but growing. Eutelsat OneWeb operates roughly 670 satellites, focused on business and government customers, while Amazon's Leo constellation had about 170 in orbit by mid-2026 and is launching rapidly.

The satellites relay your data among themselves and down to ground stations tied into the internet's backbone — so the dish on your roof is effectively joining a network whose "cell towers" are in space.

The user terminal: the dish on your roof

The part you actually touch is the terminal: a flat, pizza-box-sized antenna (Starlink's is nicknamed "Dishy"). Unlike old satellite dishes, which an installer had to aim precisely, modern terminals align themselves — you set one down with a clear view of the sky and it handles the rest through a phone app.

Inside is a phased-array antenna. Instead of physically swivelling to track satellites, it steers its radio beam electronically, hopping from satellite to satellite every few minutes as they pass overhead. No motors, no aiming — just software.

The requirements are simple but real: a clear view of the sky, since trees and buildings block the signal, and mains power. Heavy rain can temporarily degrade the connection, because the radio frequencies used are partly absorbed by water in the atmosphere.

Real-world speeds vs. the marketing

What do you actually get? Independent measurements put Starlink's typical performance at roughly 25–220 Mbps download with latency around 25 ms. In the U.S., the median download speed crossed 100 Mbps in early 2026 and topped 120 Mbps by May, according to Ookla and PCMag measurements.

That is genuinely broadband: enough for 4K streaming, video calls, and online gaming in most households. But here is the fine print of reality:

• Speeds vary. Congestion at busy hours, bad weather, and partial obstructions all cut into performance. What your neighbour gets may not be what you get.
• Uploads lag downloads. Like most consumer internet, the link is asymmetric: sending is slower than receiving, which matters if you livestream or back up huge files to the cloud.
• It's not fiber. A good fiber connection is faster, cheaper per megabit, and more consistent. Satellite wins on availability, not raw performance.

The honest pitch: satellite internet is the best internet you can get where the cable doesn't reach — not a replacement for fiber where it does.

Who it's actually for

• Rural homes beyond the reach of cable or fiber — the core market, and the reason the technology exists.
• Ships and planes, where no ground network can follow.
• Remote worksites — mines, research stations, construction camps.
• Emergency response, when disasters knock out ground networks and connectivity saves lives.
• Travellers who want home-grade internet anywhere they can see open sky.

It is not for everyone. If you already have affordable fiber or cable, keep it — satellite is unlikely to beat a good wired line on speed or value. And where 5G home internet is available, a simple 5G router can be cheaper and easier than a dish.

Related reading

• How 5G Is Changing Mobile Connectivity — the terrestrial wireless alternative for fast internet without cables.
• How Cloud Computing Powers Modern Apps — what your satellite connection actually reaches on the other end.
• What Is Edge Computing and Why It Matters — why processing data closer to remote users matters even more.

Is it right for you? A checklist

• Do you lack access to cable or fiber broadband? Satellite may be your best — or only — high-speed option.
• Can your dish see open sky? Trees, buildings, and obstructions degrade the signal.
• Do you need low latency? At roughly 25–60 ms, LEO satellite handles video calls and most gaming — unlike the 500–600 ms of old geostationary links.
• Are your uploads modest? Satellite is asymmetric; heavy uploaders should check the fine print.
• Have you compared with 5G home internet? Where coverage exists, it can be simpler and cheaper.
• Remember the rule of thumb: satellite is the best internet where cables don't reach — not a fiber replacement where they do.