A glowworm is a luminous trail of a tiny

meteor A meteor, known colloquially as a shooting star, is a glowing streak of a small body (usually meteoroid) going through Earth's atmosphere, after being heated to incandescence by collisions with air molecules in the upper atmosphere, creating a ...

, occasionally visible in the night sky during a meteor shower. The centimeter-sized

comet A comet is an icy, small Solar System body that warms and begins to release gases when passing close to the Sun, a process called outgassing. This produces an extended, gravitationally unbound atmosphere or Coma (cometary), coma surrounding ...

pieces can produce hundreds of fireballs or more each hour. In some cases, particularly during the

Leonids The Leonids ( ) are a prolific annual meteor shower associated with the comet 55P/Tempel–Tuttle, Tempel–Tuttle, and are also known for their spectacular meteor storms that occur about every 33 years. The Leonids get their name from the loca ...

, the fireballs make bright trails that can stay up for 10 to 15 minutes, according to

astronomer An astronomer is a scientist in the field of astronomy who focuses on a specific question or field outside the scope of Earth. Astronomers observe astronomical objects, such as stars, planets, natural satellite, moons, comets and galaxy, galax ...

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Leonid meteors may spawn 'glowworms'
CNN Science and Space Meteoroids {{Astronomy-stub