What potential detection method relies on a dark halo temporarily bending and brightening the light of a background star?

Answer

Gravitational microlensing.

Gravitational microlensing is an indirect detection technique where the immense mass of an invisible object, like a dark halo, acts as a lens, causing a temporary magnification of light from a source situated behind it.

What potential detection method relies on a dark halo temporarily bending and brightening the light of a background star?

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