Topics covered range from deep planetary interiors to atmospheres.

The shaft looked like it headed into the planetary interior ... but where?

First, the planetary interior is much hotter than the planetary surface.

The flow of heat, whether from the Sun or from the planetary interior, tends to drive the planet uphill slightly.

Iron, the most common element that is likely to form a very dense molten metal phase, tends to congregate towards planetary interiors.

The journal covers the physical and chemical processes of planetary interiors.

The sulfur was delivered to the deep planetary interior.

They erected enormous domes and ignited the planetary interior by bringing different elements into an atomic fusion process.

He wrote the first paper defining the principles of plate tectonics, and his early work on mantle convection created the modern discussion of planetary interiors.

If the stations were mere airlocks, and this was merely another level of a planetary interior, then they might not have gone anywhere at all.