By 2503 humankind’s understanding of the universe is fundamentally different than it is in the 21st century.
In 2503 it is generally understood that the Universe we perceive is a hyperdimensional sphere. While we perceive that we look out into space in straight lines, we are in face looking around the surface of a sphere that we can’t perceive. One way to understand this is to image that we are standing inside the skin of a soap bubble. Due to limitations in our perceptive ability, we can’t look into the center of the bubble, we can only look out along the skin. If we were able to see far enough around the surface of the bubble, we could eventually notice a figure (ourself) that seemed to be the same distance away from us everywhere we looked.
This is exactly the way we perceive the universe. While we perceive that we can look out in all directions in a straight line back to the big bang, we are in fact looking around and around the surface of an expanding sphere. While the movement of galaxies across the surface of the sphere makes it difficult to identify its exact size, the unique signature of the black hole at the center of the Milky Way, pulsars, and other long lived objects have allowed scientist to identify many object one full circumference and sometimes a many as six circumference’s ago. In 2503 it is generally understood that the universe is an expanding sphere currently about 1.2 billion light years across.
The human understanding of time is also very different. In addition to fundamental particles that can positively or negatively interact with the Higg’s Field or the Electromagnetic field, there are particles that interact negatively with the the time field. It is a part of the natural entropy of the Universe that particles move back and forth between states in a predictable manner. The Dark Matter and Dark Energy of the the 21st Century are recognized in the 26th century as various counter-time particles. While they still exert gravity and have some other impacts on our positive time universe, they are in most other ways only responsive to each other. The current time, some 15 billion years after the Big Bang, is an era when most of the matter in the Universe is experiencing counter-time, therefor we perceive most of the universe to be composed of dark matter or dark energy.
This has led to the startling conclusion that, while we perceive the big bang as the beginning of the universe, it is in fact, the moment known as the “Baden Event” when a sufficiently large percent of the Universe was in the counter-time state that it cause a collapse of the Counter Time field, dumping, for a few fractions of a second, all of the matter in the universe into the positive time space. It is assumed that there is a point some 100 billion years in the future when the positive time field will collapse under the weight of the material in it and the counter-time field will experience a big bang. From this perspective, the whole universe can be seen as a torus with positive time particles sliding up the outer surface while counter-time particles slide down the inner surface. Both surfaces are permeable and the total gravity of the Universe can be understood as the sum of the masses of particles on both side. The hyperdimensional sphere expands in positive time when most of the matter is in counter time and expands in counter-time when most of the matter is in time.
In the laboratory, particles have been artificially changed into their counter-time state. This has not led to any cross time communication or travel however as those particles are unlikely to re-enter positive time until the Big Bang.