Original: The bright star Alnitak (Î Ori), the easternmost star in the Belt of Orion, shines energetic ultraviolet light into the Flame and this knocks electrons away from the great clouds of hydrogen gas that reside there.
Simplified: The bright star Alnitak (Î Ori), the most eastern star in the Belt of Orion, shines a glow of electrons into the Flame Nebula.