Conundra

Like soul-force between two beings, gravity is only felt between two objects... It sends one thing whirling around another, and that is supposed to be a kind of falling! ? Despite gravity trying to pull things together, on a cosmic scale, they are actually flying apart. There are equations predicting how fast that is supposed to happen...but since cosmic expansion is unfolding differently than expected, we factor in dark energy to tweak the expansion rate and save the equations. That's like adding epicycles to make a planetary orbit 'regular' before we knew it was elliptical and that it wobbled. We often double the mystification by jumping to conclusions. Now there are scientists who say that stars may vent plasma jets intentionally, to keep a proper distance from each other and avoid getting snared in clouds of nebular dust. Cooler stars like our sun move more quickly around the galactic center than hotter stars of similar mass. No one has been able to explain this discrepancy. Intentional venting of plasma jets could save the equations just as well as hypothetical dark matter, as long as you're willing to believe in sentient stars. Why not? The great conundrums deserve to be pondered fancifully, to let our existential predicament be part of the solution. Go to the beach where waves of the ages pounded huge rocks to smoothness. Indeed, sand is a conducive surface to rest on while indulging in reveries across the brocade of time.