Here's why:

* Current technology limitations: Sending humans beyond Earth's orbit is incredibly expensive and technologically challenging. The distances involved are vast, and the dangers of radiation, micrometeoroids, and prolonged space travel are significant.

* No spacecraft designed for such a journey: There is no spacecraft currently in existence that could carry humans on a multi-year journey to visit all planets in the solar system and return safely.

However, astronauts have ventured beyond Earth's orbit and even landed on the moon. While not a complete solar system tour, these missions represent the furthest humans have traveled from Earth.

It's possible that in the future, technology advancements could enable human spaceflight to reach the outer solar system and beyond, but for now, traveling around the entire solar system remains a distant dream.