If you were an observer on Earth and you were somehow observing a white hole, the reason it might appear as the past could be due to the properties of spacetime near the white hole.
A white hole is a hypothetical region of spacetime that is the reverse of a black hole. While a black hole has a gravitational pull so strong that nothing, not even light, can escape it, a white hole is imagined as a region from which nothing can enter. In other words, it is a region in which matter and energy can only flow outwards.
The behavior of spacetime near a white hole is not yet fully understood, as they exist as solutions to certain mathematical equations but have not been observed in the universe. However, based on current theoretical models, a white hole is often considered as the time-reversed counterpart of a black hole.
When we think about black holes, we know that they have an event horizon, a boundary beyond which nothing can escape. Similarly, white holes are speculated to have an event horizon, but instead of preventing anything from entering, they would prevent anything from leaving. This event horizon would act as a boundary that separates the white hole from the rest of spacetime.
Now, if you were observing a white hole from Earth, it would mean that you are observing the region beyond the white hole's event horizon. Inside the event horizon, spacetime might be extremely distorted and undergoing intense gravitational effects. As a result, the light or information from the white hole's interior may not be able to reach you directly.
Instead, the information that manages to escape the white hole's event horizon and propagate through the surrounding spacetime would need to travel a long distance, likely taking a curved or circuitous path. This curvature of spacetime could lead to the observed light or information taking a longer time to reach your position on Earth.
In this scenario, the light or information you receive from the white hole might have taken a convoluted path through spacetime, passing through regions with strong gravitational effects. As a result, the light might have been significantly redshifted or time-dilated, making it appear as if it originated in the past.
It's important to note that white holes remain speculative entities, and our understanding of their properties and behavior is still a topic of research and investigation.