Why does Starlink feel so fast?

On traditional satellite internet, a video call has an awkward rhythm. You finish a sentence, and the reply arrives a beat late. People start talking over each other. Starlink also sends your connection through space, yet on most calls that pause is gone. The signal is not moving any faster. Its trip is much shorter.

▶ Play with this now in Low Orbit Internet: drag the satellite down from geostationary orbit and watch the delay shrink.

Is Starlink faster, or does it only feel faster?

An internet connection has two different speeds. Bandwidth is how much data arrives each second. Latency is how long a signal takes to get there and back. Loading a page, playing a game or holding a call involves many small exchanges. Each one waits for a round trip.

SpaceX engineers made the same point in 2024. In their testing, more bandwidth beyond about 10 megabits per second stopped speeding up web pages. Lower latency still helped. SpaceX: Improving Starlink's Latency.

How far does one click travel?

Traditional internet satellites sit in geostationary orbit, 35,786 km above the equator. At that height, a satellite circles once a day, in step with Earth's spin. It seems to hang still in the sky. Your dish can point at one spot and never move. NASA: Catalog of Earth Satellite Orbits.

Radio signals travel at the speed of light, about 300,000 km every second. Even so, the climb to geostationary orbit takes about 120 milliseconds. Your request goes up to the satellite and down to a ground station. The reply makes the same two legs back to you. Four legs add up to about half a second, before any computer has done any work. Wikipedia: Satellite Internet access.

That is slow for light. In one second, light could travel around Earth more than seven times.

What changes at 500 km?

Starlink satellites orbit roughly 500 km up. That is about seventy times closer, so every leg is about seventy times shorter. SpaceX puts each leg at 1.8 to 3.6 milliseconds, depending on the angle. The whole light-travel round trip usually stays under ten milliseconds.

Regulators weighed this too. In 2021, the FCC approved moving thousands of planned Starlink satellites down to between 540 and 570 km. The agency agreed that the lower orbit would improve speeds and latency. FCC 21-48: SpaceX modification order.

Why do you need thousands of satellites?

The catch? A low satellite cannot hang still. At about 500 km, it circles Earth in about an hour and a half. That means racing along at more than 7 km every second. Seen from your yard, each one is high in the sky for only a few minutes. Wikipedia: Low Earth orbit.

A low satellite also sees only a small patch of Earth at a time. Keeping one above every customer, all day, takes a great many. By June 2026, Starlink had more than 10,000 satellites in orbit. Your dish hands its connection from one to the next as they pass. Newer satellites can also relay signals to each other by laser. Wikipedia: Starlink.

That is the trade. A high orbit stays put but is slow to reach. A low orbit is quick to reach but needs thousands of satellites.

What does the model leave out?

Our film and Low Orbit Internet count light-travel time only. That is the floor, not the number a speed test will show. Real connections add more:

• The trip from the ground station to the website you are visiting, often through optical fiber. Light in fiber travels about a third slower than in a vacuum. Wikipedia: Speed of light.
• Detours over laser links when a direct path to the ground is busy or missing.
• Waiting in line on a busy network, and processing time at each step along the way.

SpaceX reported in 2024 that its median US latency at peak hours had dropped from 48.5 to 33 milliseconds. A geostationary round trip typically takes about 550 milliseconds, even in good conditions. So Starlink is not seventy times quicker end to end. Its delay is still far shorter, because the part set by physics is so small.

Can you hear a half-second delay?

A clap and a wall make a good stand-in for a satellite link. These steps are a suggestion, so adapt them to the child beside you. Look for a big, flat wall with open ground in front of it, away from traffic. The side of a school building across an empty field works well.

Predict. Stand about 100 yards from the wall, roughly the length of a football field. Ask your child how long the echo of a clap will take to come back. Then ask what will change if you both walk halfway to the wall. Will the echo return sooner, later or at the same time?

Try. Clap once and listen. Then clap in a steady rhythm, so each clap lands on the echo of the one before. From 100 yards away, that rhythm is close to two claps a second. Walk halfway and find the new rhythm together.

Explain. Sound travels about 343 meters each second. From 100 yards away, its round trip to the wall takes a little over half a second. That is about the wait a geostationary link adds to every click. Halve the distance and you halve the wait, so you had to clap about twice as fast. Starlink did the same thing by moving its satellites about seventy times closer. Wikipedia: Speed of sound.

Many internet speed tests also report latency, sometimes labeled ping, in milliseconds. Before you run one at home, make a prediction together. Then compare your number with the half second of a geostationary link.

Low Orbit Internet is an ExplainerTools Original. Its concept was inspired by Ryan Sael's Home internet from space. For the next question, explore Sael's model and watch a dish hand its connection from one satellite to the next.