Which independent technique for measuring $H_0$ involves analyzing the time delay between multiple light paths caused by a foreground galaxy lensing a distant source?
Answer
Time-delay cosmography
Time-delay cosmography uses gravitational lensing effects, where the light from a variable source takes different path lengths around a massive galaxy, allowing the measurement of time delays to calculate absolute distance and constrain $H_0$.
#Videos
Hubble Constant: An Expanding Universe - YouTube
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