The universe's expansion may actually have started to slow rather than accelerating at an ever-increasing rate as previously thought, a new study suggests.
"Remarkab...
They mean both I believe since the physical properties of the universe are what would presumably drive its expansion, and this expansion results in the cosmological objects in the universe getting farther apart. Actually more than that, it was previously thought that they are accelerating apart, so they would be moving apart at ever increasing speed. However this new data is being presented as evidence that the expansion of the universe is actually slowing down. Still moving apart but at an ever slower rate.
They mean both I believe since the physical properties of the universe are what would presumably drive its expansion, and this expansion results in the cosmological objects in the universe getting farther apart. Actually more than that, it was previously thought that they are accelerating apart, so they would be moving apart at ever increasing speed. However this new data is being presented as evidence that the expansion of the universe is actually slowing down. Still moving apart but at an ever slower rate.