What factor causes a single, isolated dip in stellar brightness to be considered unreliable evidence for an exoplanet discovery?

Answer

It could be caused by stellar flare activity or a passing asteroid.

A single dip might be attributable to transient noise sources; confidence requires the signal to be periodic and repeatable, suggesting a stable orbiting body.

What factor causes a single, isolated dip in stellar brightness to be considered unreliable evidence for an exoplanet discovery?

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How to Detect EXOPLANETS - The Transit Method - YouTube

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