5 things to know about how Starlink satellites work

A line of Starlink satellites can make a launch feel like a finished delivery. The hardware still has work to do. A satellite must reach its working orbit, point the right way, keep its electronics powered and move information through a network. Its eventual exit from orbit belongs in that story, too.

These are five selected jobs, not five satellite models. Starlink has used different spacecraft designs, so a detail from one generation should not become a claim about every satellite overhead. The examples below follow SpaceX's published technical descriptions; they are operator descriptions rather than independent measurements of network performance.

1. They use onboard propulsion after the rocket lets go

Deployment is a handoff. The launch vehicle releases the satellites, and their own propulsion helps move them toward operating orbits. SpaceX describes ion propulsion as serving orbit raising, maneuvering and eventual deorbiting. Its 2024 report identifies argon propulsion on the V2 Mini design. That is a useful reminder to attach a date or version to a hardware claim. Source: Starlink's 2024 progress report.

For a reader following a launch, the useful distinction is between the rocket's delivery and the satellite's later work. A deployment announcement does not by itself tell you that each spacecraft has finished commissioning or is already carrying customer traffic. Those are separate questions for mission and operator updates.

2. Knowing which way they face is a full-time job

Position and orientation answer different questions: where is the satellite, and which way is it pointing? Starlink's technical description identifies star trackers and reaction wheels among its systems. Star trackers use observations of stars as orientation references; reaction wheels help control spacecraft attitude. Here, “attitude” means orientation, not a personality trait. Source: Starlink technology.

This is the less photogenic side of spaceflight. A spacecraft can be in an appropriate orbit and still need careful pointing to do its job. When comparing satellite diagrams, look for navigation sensors and pointing hardware as well as the large antennas. The small components help make the large ones useful.

3. Sunshine has to become usable electrical power

The hardware description in Starlink's 2024 progress report includes dual solar arrays and a battery. Solar arrays generate electricity from sunlight, while stored energy gives the power system another resource when sunlight is unavailable. The published configuration is an example to understand, not a promise that every Starlink design has an identical silhouette. Source: Starlink's 2024 progress report.

That gives you a better question to ask about a spacecraft rendering: which surfaces collect energy, and which do another job? A large flat surface is not automatically an antenna. Check the labels before turning a visual resemblance into a confident identification.

4. Some of the networking happens between satellites

SpaceX describes optical intersatellite links, or ISLs, as laser connections between spacecraft. Think of a possible path as user terminal, satellite, another satellite, then a route back into terrestrial networks. That sketch explains the role of a crosslink; it is not a trace of a real internet session. Actual routing depends on the network. Source: Starlink technology.

The distinction matters when a diagram draws a straight line from a satellite to the ground. That drawing may leave out intermediate links. Equally, the existence of laser links does not establish that your own connection used one, or guarantee a particular speed or delay.

5. Leaving orbit is part of the operating plan

SpaceX says it uses propulsion to deorbit satellites at the end of their useful lives and proactively removes satellites assessed as more likely to lose maneuverability. Its February 2024 sustainability update also describes atmospheric drag as a fallback for failed spacecraft in low orbit. Those are the operator's stated approach and design assumptions, not a guarantee that every retirement follows the same timeline. Source: Starlink's dated sustainability update.

Keep three events separate when reading the news: a decision to retire a spacecraft, maneuvers to lower its orbit, and its eventual atmospheric reentry. A report about one does not automatically establish the others.

A five-question reading checklist

• Which spacecraft generation or dated design is the source discussing?
• Is the event deployment, orbit raising, commissioning or routine operation?
• Does a diagram distinguish antennas, solar arrays and navigation hardware?
• Is a communications path illustrative or actually measured?
• Does a retirement update describe an intention, a maneuver or completed reentry?

For the orbital vocabulary behind these questions, continue with LaunchDetect Academy's orbital mechanics primer. You can also browse LaunchDetect's launch archive and inspect a published evidence record where one is available. A launch observation does not establish a satellite's later communications performance.