That's a tricky question! There are two ways to interpret "last real" in this context:

* Last in distance from the sun: If you're asking which planet is farthest from the sun, then the answer is Neptune. It's the eighth and outermost planet in our solar system.

* Last discovered: If you're asking which planet was discovered most recently, then the answer is still Neptune. It was discovered in 1846, after Uranus in 1781.

Let me know if you have any other questions about our solar system! 😊