<s>[INST] This is a question about a hypothetical scenario. Please answer in the context of this scenario.

Imagine a world where time travel has just become possible. The first time travelers have just returned from their journey. They brought back a piece of paper with them, the paper contains a message written on it. The message reads: "Hello, we have really enjoyed the Universal Exposition in Paris, 1889. Come join us!"

The people living in the present are shocked by this message. They are also very curious as to what the message could mean. Many of them start to speculate about the nature of the time travelers, their intentions and the Exposition mentioned in the message. Speculations and theories start to emerge, including the following:

* Some people think that the time travelers are actually aliens who have been visiting earth for centuries, and the Exposition refers to an intergalactic event that took place in Paris in 1889.
* Others believe that the time travelers are humans from a parallel universe, and the Exposition was a significant event that took place in their universe, but not in ours.
* Some scientists claim that the message is a hoax, and that the time travelers did not actually travel through time. They argue that the paper and the message could have been created in the present day.

Given these speculations and the message, what are some potential implications of the message for our understanding of time travel?[/INST]