The first layer is the crust, a thin outer shell that extends about 18 miles (30 km) below the planet's surface. The next layer, the mantle, stretches about 1,800 miles (2,900km) below Earth's ...

Shaking from large earthquakes provides hints about something different at the center of the planet ... diagram of the Earth showing four neatly delineated layers: a thin outer shell of rock ...

This is also called the habitable zone, when a planet is the right distance from its star to have a comfortable temperature and liquid water pooling on its surface. And as far as we know ...

or about 75% of the planet's diameter. In comparison, Mercury's outer shell is only 300 to 400 miles (500 to 600 km) thick. The combination of its massive core and composition, which includes an ...

To investigate what might be beneath this mystery, the researchers tested in a computer model how the topography of Titan might relax or rebound after an impact if the ice shell was covered with a ...