What specific formation are observers witnessing when they report a crisp, white line shortly after a Starlink deployment?

Answer

A tight, low-Earth formation strung out like a close-knit group of lights.

The distinct white line is the result of newly deployed Starlink satellites placed into a tight, low-Earth formation, often described as a "train" or "string of pearls" crossing the sky in a remarkably straight line.

What specific formation are observers witnessing when they report a crisp, white line shortly after a Starlink deployment?
nightskyatmospherephenomenonwhite line