Here's why:

* Earth's density is 5.52 g/cm³. This is due to its composition, which is primarily iron and nickel in its core, along with a rocky mantle and crust.

* Other planets are less dense:

* Gas giants like Jupiter and Saturn are primarily composed of hydrogen and helium, making them very light.

* The rocky planets like Mars and Venus are less dense than Earth because they have different compositions and less heavy elements in their cores.

Let me know if you have any other questions!