Why do brilliant blue light sources dominate the brightest detections in an active stellar nursery?

Answer

Only the largest stars have had time to ignite and outshine their peers

In a short window of active star formation, only the largest, most massive stars have had time to ignite and shine brilliantly enough to dominate the brightest detections.

Why do brilliant blue light sources dominate the brightest detections in an active stellar nursery?
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