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- In 2007, John Moffat proposed a modified gravity hypothesis based on nonsymmetric gravitational theory ( NGT ) that claims to account for the behavior of colliding galaxies.
- Moffat is best known for his work on gravity and cosmology, culminating in his nonsymmetric gravitational theory and scalar tensor vector gravity ( now called MOG ), and summarized in his 2008 book for general readers, " Reinventing Gravity ".