Why do airplanes have big front "headlights"?

I live near a major airport and see commercial planes with huge front headlights shining in the night sky. What could they be good for way up in the sky, though? I get that when they are taking off/landing headlights are necessary. Why not give them lights like a boat, with a green in front and a red in back?

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14•5 days ago
Why pretend, we both know perfectly well what this is about. You want me to have an abortion.

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