Meteoroids Create 'Shooting Stars' at 11-72 Kilometers Per Second
Updated
Updated · spacedaily.com · Jul 2
Meteoroids Create 'Shooting Stars' at 11-72 Kilometers Per Second
3 articles · Updated · spacedaily.com · Jul 2
Summary
Tiny meteoroids—not stars—produce visible “shooting stars” when grains of dust or small pebbles hit Earth’s upper atmosphere and flash across the sky.
At 11 to 72 kilometers per second, their kinetic energy ionizes a thin column of air, creating light mostly 80 to 120 kilometers above Earth rather than the rock simply burning.
Most visible meteors come from particles smaller than 1 to 2 grams, often ranging from a grain of sand to a small pebble, with the glowing trail usually less than a meter wide.
Comet debris supplies most of that material, including meteor showers such as the Perseids, while asteroid collisions provide the rest; about 80% of dust reaching the ground is traced to comets.
NASA estimates roughly 48.5 tons of space material reaches Earth daily, though only particles above about 2 millimeters usually make the streaks people can see.