The omphalos hypothesis is an idea in science that says maybe everything was created to look like it had a history, even though it was actually created very recently. It's like if you were to make a painting and then you made it look really old.
This idea was first put forward by a man named Philip Henry Gosse, who was a scientist in the 1800s. He believed that the Earth was actually created only a few thousand years ago, but it was made to look much much older.
For example, if you found a rock that looked like it had been around for millions of years, Gosse would say it's possible that it was actually made to look that way by whoever created everything. It's kind of like how people fake their age online or with filters on social media.
Now, while this idea may seem strange, it's important to remember that it's just a hypothesis, which means it's an idea that needs more testing and evidence before it can be accepted as true. Scientists today generally believe that the Earth is much older than just a few thousand years, based on evidence like fossils and geological formations.