Scientific exploration has yielded evidence that the Universe operates in manners that appear impossible when it is examined at extremely large and small scales of time and space.
While it isn't critical to understand modern physics in detail, it is important to understand that the concepts described by it are neither imaginary nor purely theoretical. By-and-large, they are accurate descriptions of Physical Reality -- much, much better at explaining and predicting Physical Reality than our common sense is.
Our cumulative lifetime experiences form the framework we use for making decisions -- the strongest tenets from this framework form what we refer to as common sense. Layered upon that is our intellectual learning. The latter can override the former, but it is naturally difficult for a learned concept to be given more weight than one that results from direct experience.
For example, a thousand years ago it would have been silly beyond description to believe that we could have a ball of rock two thousand miles in diameter floating above our heads. in large part this is because our common sense tells us that rocks don't simply float "in thin air," not to mention ones that big. Of course today we know that the moon is, in fact, a huge rock floating above us with no visible support. We hear enough in today's news about gravity (and the absence thereof) that these concepts are becoming more intuitively acceptable, but they probably won't ever become common sense until people routinely experience a lack of gravity.
Unfortunately, our common sense, which we rely on so heavily, comes from what we experience via our physical senses and our physical senses are only capable of perceiving unimaginably small portions of the Universe. Very small or very large lengths of time or spans of space fall completely outside of our ability to perceive and comprehend them. This is important because different physical laws take precedence at different scales of time and space. As a result, because events are driven by physical laws that we have no direct perception of (and hence no direct experience with), events occur which conflict mightily with our common sense -- in short, the (seemingly) impossible happens (Ref: 1).
The more our intellectual pursuits reveal the limitations of our common sense, the clearer it becomes how vast is our misunderstanding of Physical Reality.
It seems to me that Physical Reality is not what we think it is.
References:
1. "The View from the Center of the Universe: Discovering Our Extraordinary Place in the Cosmos" by Joel R. Primack and Nancy Ellen Abrams