White sphere with evasive maneuver over Chamonix, 1978

Summary

On September 4, 1978, a group of witnesses in Chamonix saw a white spherical object flying at aircraft speed on a north-south trajectory between nearby peaks. When another plane approached from the opposite direction, the object climbed vertically, changed color, and disappeared rapidly. Sounds were heard during the observation. The gendarmerie could not gather further information, though the evasive maneuver and noise suggest a possible military jet.

GEIPAN classified the case as B, favoring a conventional military explanation without fully ruling out something unusual. Witnesses agreed on the description, and the object's reaction to the approaching aircraft continues to raise questions.