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On a clear night, both appear as bright points of light moving against the stars. If you are new to stargazing, a single streak can leave you wondering what you just saw. The good news is that with a little practice, the differences become obvious. Meteors and satellites behave in fundamentally different ways, and once you know what to look for, you can usually tell them apart in seconds.
Duration is the most reliable giveaway. A meteor is a fleeting event. It is caused by a tiny piece of space debris burning up in Earth’s atmosphere at dozens of kilometres per second. Most meteors last less than a second. Even a bright one rarely stays visible for more than two or three seconds. Satellites, by contrast, are solid objects in orbit, lit by the Sun. They typically take several minutes to cross the sky. If you have time to point it out to a friend, it is almost certainly a satellite.
Meteors, often called shooting stars, appear without warning. They can flash into view anywhere in the sky, though during a meteor shower they tend to radiate from a particular constellation. Their speed is startling: a meteor can cross a large part of the sky in the blink of an eye. Many leave a brief trail, and the brightest can leave a persistent train—a faint, glowing streak that lingers for a few seconds or even minutes after the meteor has gone. Colours vary with the meteoroid’s composition and the atmosphere it passes through. Green, yellow, orange and red are all possible. Some meteors fragment, producing multiple flashes along the same path.
Satellites move with a calm, constant grace. They trace a smooth, straight line across the sky, usually at a steady speed. Most look like a moving star that does not twinkle. They often brighten gradually as they rise, then fade as they enter Earth’s shadow or move into darkness. A satellite can take five or ten minutes to cross from horizon to horizon, depending on its orbit and your latitude. They do not leave glowing trains. If a moving light suddenly vanishes, it has probably entered the shadow of the Earth, not burned up.
Not every sighting fits neatly into one category. A fireball—an exceptionally bright meteor—can last several seconds and leave a smoky train, making it look slower than a typical meteor. Some satellites produce brief flares when their solar panels catch the Sun at the right angle, causing a sudden brightening that fades over a few seconds. Tumbling satellites can flash periodically as they rotate. Re-entering space debris can look like a slow, fragmented meteor. Aircraft are another common confusion: they have blinking navigation lights, move more slowly, and often make a sound. If you see flashing red and white lights, it is an aircraft.
Next time you are out under the stars, try this practical routine. Give your eyes at least twenty minutes to adapt to the dark, and use a red torch if you need light. When you spot a moving light, watch it for at least fifteen seconds. Note its path, its speed, and whether its brightness changes. Check the time: satellites are most visible in the hours after sunset and before sunrise, when they are still in sunlight whilst the sky below is dark. Meteors can appear at any time, but showers are best after midnight. With a little patience, you will soon be able to tell a meteor from a satellite without a second thought.
Aster Report shares practical, down-to-earth guidance on amateur astronomy and stargazing for beginners in the uk for readers across the UK.
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