What characteristic of the Geminid debris stream contributes to its long activity window compared to cometary showers?

Answer

The rocky debris from Phaethon persists longer than vaporizing ice.

Because the material comes from a rocky asteroid rather than icy comets that sublimate quickly, the debris trail is more stable and lasts longer in orbit.

What characteristic of the Geminid debris stream contributes to its long activity window compared to cometary showers?

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