A fireball in the sky? A bright meteor or reentering space debris

6 min read

A dazzling greenish or orange streak of light crosses the sky, flares at the end, sometimes breaks into pieces, and is over within a few seconds. People in Hungary see this several times a year too, and each time there are always a few "crashing UFOs" among the reports. In reality it is a fireball, that is, an especially bright meteor. We show you how to recognize one, what the difference is between a meteor, a fireball and reentering space debris, and what to do if you have seen one.

What is a fireball?

A meteor (commonly called a shooting star) occurs when a small piece of rock or metal from space enters Earth's atmosphere at high speed and starts to glow at an altitude of about 70–120 kilometers. Most meteors are caused by dust-sized or sand-grain-sized particles; these appear as a faint streak that flashes for an instant.

A fireball is an especially bright meteor: according to NASA's definition, it is of magnitude –3 or brighter if seen above the observer's head, at the zenith, meaning its brightness is comparable to that of Venus and Jupiter. Such fireballs are caused by larger pieces, a few centimeters in size or bigger. If the fireball explodes at the end with a strong flash, it is also called a bolide. Larger fireballs can, rarely, leave behind a meteorite, that is, a piece of rock that falls to the ground.

What does it look like?

Very bright, sometimes lighting up the entire landscape for a moment.
Short: a few seconds, rarely longer than 10 seconds.
Colorful: often greenish, bluish, yellowish or orange, depending on the meteor's material and speed.
It leaves a streak, and sometimes a smoke trail or a faintly glowing band remains afterward.
It may flare at the end and break into pieces.
There is usually no sound. Very rarely, if the fireball gets low, a dull boom can be heard a minute later.

Why is it misleading?

It seems close. A fireball often looks as if it fell "behind the hill" or "in the next village." In reality it travels at about 100 kilometers altitude, often hundreds of kilometers away, and almost always burns up in the atmosphere. The same fireball can be visible from several countries at once.
"Crashing plane" or "burning object." Many people take the orange, flaming streak and the breaking into pieces for a crashing aircraft or a UFO.
The colors. Greenish or bluish light is unusual and gives an "alien" impression.
The surprise. Nobody expects a fireball, and nobody is prepared for it. Because of the excitement and the short duration, reports are often inaccurate: a few seconds become "half a minute," 100 kilometers become "a few hundred meters."

Fireball or reentering space debris?

A sight similar to a fireball occurs when a decommissioned satellite or a rocket's upper stage reenters the atmosphere. The most important difference is duration and speed: meteors arrive at speeds of 11–72 kilometers per second and burn up within a few seconds. Reentering spacecraft are much slower (about 7–8 km/s), so they are visible for half a minute or even several minutes, and they move across the sky broken into many orange pieces, "in a train."

Poland, 2025. In the early morning of February 19, 2025, the upper stage of a SpaceX Falcon 9 rocket reentered the atmosphere over Europe. Many people from Great Britain to Germany filmed the slow plume of fire breaking into pieces, and its fragments came down near Poznań, Poland.

Characteristics of a meteor, a fireball and reentering space debris. Duration is the best distinguishing sign. Sky Glitch chart

Hungarian fireballs

March 6, 2026. After 9 p.m., a fireball visible for about 11 seconds passed over eastern Hungary; it was recorded by several Időkép webcams.
October 3, 2025. At 22:14, a bright fireball was visible from several places in the country. According to the meteor section of the Hungarian Astronomical Association, it passed over the Jászberény–Jobbágyi line, and based on their calculations tiny meteorites may have fallen around Jobbágyi and Apc. The experts asked the public for help with the search.
October 24, 2024. A dazzling fireball over Lower Austria caused near-daylight brightness for a moment. According to Időkép, it was also visible from northwestern Hungary.

Two famous fireballs abroad

**Normandy, 2023: the asteroid discovered by Hungarians.** On February 12, 2023, Krisztián Sárneczky, an astronomer at Konkoly Observatory, used the telescope at Piszkéstető to discover an asteroid about 1 meter across that was on a collision course with Earth. The object, designated 2023 CX1, entered the atmosphere over the English Channel about six hours later, in the early morning of February 13, and exploded as a fireball. British and French meteor cameras recorded it, and volunteers of the French FRIPON network found several meteorite fragments in Normandy within days, the first in the village of Saint-Pierre-le-Viger. This is one of the best examples showing that a fireball is not a mystery but a well-measurable, and sometimes even predictable, phenomenon.
Great Britain, 2021. On the evening of February 28, 2021, a bright fireball crossed England from west to east and broke into pieces in its second half. The British astronomical society received more than a thousand reports, and the British meteor camera network also calculated its exact trajectory. According to experts, meteorites may have fallen around Cheltenham.

How to check, and what to do

Write down the exact time immediately. To the second, if possible. Meteor cameras and other reports are matched to this.
Note the direction, the start and end points, the altitude (for example with the fist method), the color and the duration.
Check the news and webcams. For a larger fireball, footage often appears that same evening or the next day, for example from Időkép's webcams.
Report it. In Hungary, the meteor section of the Hungarian Astronomical Association collects sightings. Many countries also run their own reporting sites (for example the British fireball alliance, UKFAll), and this data goes into the network of the International Meteor Organization (IMO). The more reports arrive from different locations, the more precisely its trajectory can be calculated, as well as whether a meteorite may have fallen.
If you find a meteorite, do not touch it with bare hands: put it in a clean plastic bag or aluminum foil, and notify the experts.
If it was visible for minutes, moved slowly and broke into many pieces, suspect reentering space debris instead.

Quick identifiers

Very bright, often greenish or orange streak
A few seconds
May flare at the end and break into pieces
Usually silent
Seems close, but travels at about 100 km altitude

Did you see something strange in the sky? Start with the decision tree, and if you can't find the answer, send us the footage!

The sober take

A fireball is not a mystery but a meteor burning up in the atmosphere. Material arriving from space starts to glow at high altitude, and a fireball is an especially bright case of this; a streak that is visible for longer and breaks into pieces may be reentering space debris, as in the Falcon 9 case of February 19, 2025.