Here's why:

* Jupiter is a planet: Planets orbit the Sun and their positions in the sky change over time.

* The Big Dipper is an asterism: It's a pattern of stars within the constellation Ursa Major (the Great Bear). These stars are fixed relative to each other.

Therefore, Jupiter can appear near the Big Dipper at certain times, but it will never be directly in the middle of it.

If you're looking for Jupiter, you can use a stargazing app or website to find its current position in the sky.