What is the Starlink train and how to see it

If you have ever looked up and seen a line of bright dots moving in perfect formation across the sky, evenly spaced, silent, and steady — you probably saw a Starlink train. It is not the ISS, not a plane, and not a meteor. It is a freshly launched batch of SpaceX internet satellites, still bunched together before they spread out into their working orbits.

What is happening

SpaceX launches Starlink satellites in batches of roughly twenty to sixty at a time, packed together inside a Falcon 9 fairing. After deployment, the satellites are released one after another and begin raising their orbits from the initial parking altitude (around 300 km) to their operational altitude (roughly 550 km). For the first few hours and days, they are still close together and drifting in a line — a formation that looks, from the ground, like a string of pearls moving in single file across the sky.

Why it is only visible briefly

The train is a temporary phenomenon. Over the course of one to three days the satellites fire their ion thrusters and gradually spread apart, climbing to their working altitude. As they disperse, they become too far apart to form a visible line, and each individual satellite grows dimmer as it moves further from Earth. SpaceX also orients the satellites to reduce their reflectivity once they reach operating altitude — turning their sun visors edge-on to the Sun.

If you want to see a Starlink train, you have a window of roughly 24 to 72 hours after a launch. After that the formation dissolves and the satellites become difficult or impossible to see with the naked eye.

How to spot one

The conditions are the same as for seeing the ISS:

1. Go out during twilight — the hour after sunset or before sunrise. You need a dark sky while the satellites are still lit by the Sun.
2. Find a dark spot with a clear view and as few streetlights as possible.
3. Know when to look. Starlink passes are predictable — sites like Find Starlink and Heavens-Above publish pass times for recent launches, filtered by your location.
4. Look for the line. Unlike the ISS, which is a single bright dot, a Starlink train is a sequence of dots moving together in a straight line, evenly spaced, taking three to five minutes to cross the sky.

The brightness varies. A fresh batch, still at low altitude, can be surprisingly bright — sometimes rivalling the ISS itself. Older batches that have partially dispersed are dimmer and harder to pick out.

How to tell it apart from the ISS

The two are easy to confuse at first glance — both are bright, both move steadily across the sky, both appear during twilight. The differences:

	ISS	Starlink train
Count	One dot	Many dots in a line
Brightness	Very bright (mag −4)	Moderate (varies)
Spacing	Single object	Evenly spaced chain
Frequency	Passes regularly	Only 1–3 days after launch

If you see one bright dot, check our pass predictions — it is probably the ISS. If you see a line of dots, it is almost certainly a Starlink train.

How often do launches happen

SpaceX launches Starlink batches roughly every one to two weeks, and has done so since 2019. As of mid-2026, over six thousand Starlink satellites are in orbit. Each launch creates a brief window of visibility for observers on the ground — a recurring event that you can plan for if you follow the launch schedule.

The controversy

The Starlink constellation has drawn criticism from astronomers, who argue that thousands of bright satellites in low orbit interfere with ground-based telescopes. SpaceX has responded with sun visors and darkened coatings (the “DarkSat” and “VisorSat” designs), but the concern has not gone away. The trains are beautiful to watch, but they represent a real tension between commercial satellite networks and scientific observation of the night sky.

To track the object you can see most reliably — the International Space Station — use our live tracker or read about what makes it visible.