Which two objects collided in the devastating 2009 event, which served as a classic example of man-made orbital threats?

Answer

The defunct Russian military satellite Kosmos-2251 and the active Iridium 33

The 2009 satellite collision involved the non-operational Kosmos-2251 and the active commercial satellite Iridium 33, resulting in the destruction of both objects.

Which two objects collided in the devastating 2009 event, which served as a classic example of man-made orbital threats?

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