Meteors glow because a meteoroid enters the atmosphere at tremendous speed and compresses the air in front of it. This heats the surrounding gas and the object’s outer layers, producing light as material ablates and vaporizes. The streak is not a star falling from space; it is a small body interacting with Earth’s atmosphere.
From space rock to shooting star
Before it enters the atmosphere, the object is a meteoroid. The visible streak is a meteor, and any surviving fragment found on the ground is a meteorite. NASA notes that compression of air during atmospheric entry heats the gas and contributes to the glow. [1] The process usually unfolds high above the surface and can last only seconds.
Why speed matters
Earth encounters many meteoroids at tens of kilometres per second. At those speeds, air cannot move aside gently; it is rapidly compressed and heated. The meteoroid’s surface also loses material through ablation. The hot gas, vaporized atoms and excited molecules emit light, with colour influenced by both the object’s composition and atmospheric gases.
Not every meteor reaches the ground
Small particles often break apart or vaporize completely. Larger objects may fragment into several pieces, producing a brighter fireball and sometimes meteorites. A meteor shower occurs when Earth crosses a stream of debris, often left by a comet. Learn how comet tails point away from the Sun for a related story about small Solar System bodies.
Is friction the only reason a meteor glows?
No. Friction contributes, but rapid compression of air and heating and ablation of the meteoroid are central parts of the process.
Sources and evidence
- NASA — Chapter 1: The Solar System ↗
NASA explains atmospheric compression and heating during a meteoroid’s entry.
- NASA JPL — Fireballs ↗
NASA JPL defines meteors and fireballs and describes atmospheric braking and heating.
Sources consulted: 11 October 2026. Written with AI assistance and checked against the linked references; not independently reviewed by a subject specialist. Sources do not endorse this article. See our editorial policy.
Revision: Initial publication; the explanation was checked against the linked institutional and research sources.