For generations, we've pictured the Solar System as a stable and orderly place: planets forming where they are today and quietly orbiting the Sun for billions of years. But what if that picture is wrong?

In this episode, we explore the Grand Tack Hypothesis, a fascinating idea suggesting that Jupiter may have migrated deep into the young Solar System before reversing course and heading back outward. Along the way, the giant planet may have reshaped the asteroid belt, influenced the formation of Mars, and helped determine whether Earth as we know it could exist at all.

We'll also take a closer look at Jupiter's complicated reputation as both protector and troublemaker. Does the Solar System's largest planet shield Earth from dangerous impacts, or does it sometimes send trouble our way?

Later, we'll celebrate the arrival of summer with a look at the summer solstice and explore what's happening in this week's night sky, including the Moon, the bright evening planets, the Summer Triangle, and the first great views of the summer Milky Way.

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