Faced with these deep dilemmas, some physicists are accordingly pursuing theories of "modified gravity," where hallowed rules can be bent or even broken. Suffice to say, general relativity is a day late and a dollar short. To account for the way galaxies cluster and whirl without flinging their stars into space, theorists have had to slot in another mysterious entity, a gravity-exuding dark matter. Nor does it accommodate dark energy, a mysterious, gravity-defying entity comprising around 70% of the universe. Zooming out to the universe as whole, general relativity fails to explain severely conflicting measurements of how fast the cosmos is expanding. For starters, general relativity's gravity does not mathematically mesh with nature's other three forces (namely the strong, weak, and electromagnetic interactions). Yet general relativity is not the be-all-end-all when it comes to gravitation.
0 Comments
Leave a Reply. |