The Use of Gravitational Lensing to Measure Dark Matter and How Gravitational Lensing Works

Gravitational lensing is a technique used to measure things like dark matter, because dark matter doesn't emit light. Under normal circumstances light travels in a straight line through space-time but if there is something in the way, it creates gravitational pull which distorts not only space-time but light as well. Gravitational lensing takes advantage of this principle to see something which cannot be seen otherwise...

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