A Helion meteoroid is a
meteoroid
A meteoroid () is a small rocky or metallic body in outer space.
Meteoroids are defined as objects significantly smaller than asteroids, ranging in size from grains to objects up to a meter wide. Objects smaller than this are classified as mic ...
that arrives from the approximate direction of the Sun. They are thought to originate as debris from
sun-grazing comets.
References
"Exploding Lunar Eclipse", an article about an attempt to observe Helion meteoroids Science@NASA, August 27, 2007.
Meteoroids
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