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- TL;DR Summary
- Does gravitational lensing support the MOND theory?
Do gravitational lensing observations support the need for huge amounts of DM? If so, what do the MOND proponents say about that?
Gravitational lensing is a phenomenon in which the gravity of a massive object, such as a galaxy or a cluster of galaxies, bends the path of light from a distant object, causing it to appear distorted or magnified.
MOND (Modified Newtonian Dynamics) is a theory proposed as an alternative to dark matter to explain the observed discrepancies in the rotation curves of galaxies. It suggests that the laws of gravity need to be modified at low accelerations, rather than the presence of invisible matter.
MOND suggests that at low accelerations, the gravitational force between two objects is stronger than predicted by Newton's laws. This would account for the observed discrepancies in the rotation curves of galaxies, without the need for the presence of dark matter.
The evidence for dark matter comes from various observations, such as the rotation curves of galaxies, the gravitational lensing of light, and the large-scale structure of the universe. These observations cannot be explained by the known matter in the universe, and dark matter is currently the leading explanation.
While MOND and dark matter are competing theories, it is possible for both to coexist. Some scientists have proposed modified versions of MOND that incorporate dark matter, while others suggest that MOND may only be applicable in certain circumstances. However, further research is needed to fully understand the relationship between dark matter and MOND.