What if dark energy is a form of gravity that envelopes the universe, like a shell around the universe
While the exact nature of dark energy is still unknown, the current understanding among physicists is that dark energy is not a form of gravity that envelopes the universe like a shell.
Gravity is a force that causes objects with mass to attract each other, while dark energy is a force that causes the expansion of the universe to accelerate. While both gravity and dark energy affect the behavior of the universe, they are fundamentally different phenomena with different properties.
There are several lines of evidence that suggest that dark energy is not a form of gravity. For example, the acceleration of the universe's expansion due to dark energy appears to be uniform in all directions, while gravity is a force that depends on the distribution of matter in space. Additionally, the effects of dark energy become more dominant over time, while the effects of gravity weaken as objects become more distant from each other.
So while it's always possible that new evidence could emerge that changes our understanding of dark energy, the current scientific consensus is that dark energy is not a form of gravity that envelopes the universe like a shell.