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As the alignment changes, the source's apparent brightness changes, and this can be monitored to detect and study the event. Unlike with strong and weak gravitational lenses, a microlensing event is a transient phenomenon from a human timescale perspective.
As the alignment changes, the source's apparent brightness changes, and this can be monitored to detect and study the event. Thus, unlike with strong and weak gravitational lenses, a microlensing event is a transient phenomenon from a human timescale perspective.