Is There a 'Fifth Force' that Alters Gravity at Cosmos Scales?

Is There a 'Fifth Force' that Alters Gravity at Cosmos Scales?: Radical new research is attempting to characterize the properties of a fifth force that disrupts the predictions general relativity makes outside our own galaxy, on cosmic-length scales. University of Pennsylvania astrophysicist Bhuvnesh Jain, says the nature of gravity is the...