meteoroid

A meteoroid is a small rocky or metallic body in outer space. Meteoroids are significantly smaller than asteroids, and range in size from small grains to one-meter-wide objects. Objects smaller than this are classified as micrometeoroids or space dust. Most are fragments from comets or asteroids, whereas others are collision impact debris ejected from bodies such as the Moon or Mars. When a meteoroid, comet, or asteroid enters Earth's atmosphere at a speed typically in excess of 20 km/s, aerodynamic heating of that object produces a streak of light, both from the glowing object and the trail of glowing particles that it leaves in its wake. This phenomenon is called a meteor or "shooting star". Meteors typically become visible when they are about 100 km above sea level. A series of many meteors appearing seconds or minutes apart and appearing to originate from the same fixed point in the sky is called a meteor shower.

Read more in the app

NASA’s InSight Lander Detects Seismic and Acoustic Waves from Meteoroid Impacts on Mars

Listen to the sound of a meteoroid striking Mars

NASA’s InSight ‘Hears’ Its First Meteoroid Impacts on Mars

NASA’s InSight ‘Hears’ Its First Meteoroid Impacts on Mars

NASA’s InSight hears its first meteoroid impacts on Mars: The Mars lander’s seismometer picked up vibrations and sounds from four impacts in the past two years

Meteoroid impact on JWST caused significant uncorrectable damage 😳

NASA Mission Helps Solve a Mystery: Researchers Figure Out Why Asteroid Bennu Is So Surprisingly Rocky. The team concluded that very little fine regolith is produced from Bennu's highly porous rocks because these are compressed rather than fragmented by meteoroid impacts.