Uncover the mysteries of Mars' magnetic field, generated by a molten core, unlike Earth's solid core structure.

Like Earth, Mars once had a strong magnetic field that shielded its thick atmosphere from the solar wind. But now only the magnetic imprint remains. What's long baffled scientists, though, is why this ...

The moon is intimately familiar to most people simply because it's a constant in the night sky, but its interior is more of a ...