No, Earth is not the densest planet in our solar system. That title belongs to Mercury.

Here's a breakdown:

* Mercury: Density of 5.43 g/cm³

* Earth: Density of 5.52 g/cm³

* Venus: Density of 5.24 g/cm³

* Mars: Density of 3.93 g/cm³

* Jupiter: Density of 1.33 g/cm³

* Saturn: Density of 0.69 g/cm³

* Uranus: Density of 1.27 g/cm³

* Neptune: Density of 1.64 g/cm³

While Earth is very dense, Mercury's higher density is attributed to its composition: a large iron core that makes up a significant portion of its mass.