In 1666 Oxford University was closed due to the spread of plague and Newton had to go home where he still had time to think. This is the era when he undertook an explanation of gravity. Funny things pandemics. While most of the math checked out it did not explain why.
Borrowing ideas of curved space Albert E refined gravity in terms of energy forces further in general relativity.
Today in an effort to explain why an ant's legs can overcome the entire gravity of our planet we have measured the most miniscule force of gravity in comparison to the other 3 fundamental forces. Well we don't really care about an ant's legs but gravity is minus 67 the power of ten compared to other forces. ITS SMALL On top of that it may not live here at all. There is no graviton we have found but we recently measured its wave from a billion years ago. So what the #@(& is gravity? Here is what we are thinking; There are two branes or sheets of existence hovering close to each other but not touching, some stuff leaks from one to the other like neutrinos and virtual particles and perhaps a distant remnant of a gravity force from the 'land' where gravity lives on that other brane. This unseen universe is not the dark energy or dark matter but something parallel to our entire universe. BUT it may be respondsible for our dark energy...
If the entire brane that contains the strong gravity source stretches out in all directions, then geometrically its gravity would pull in all directions pulling our universe onward and outward everywhere with acceleration.
Funny thing pandemics. They can give time to think.