Mars’ strangely small mass still puzzles planetary scientists. Definitive answers as to why are still hard to come by.

Earth is full of mysteries that scientists have yet to fully understand. Despite years of research, some phenomena remain ...

But despite its significance, it's a bit of a puzzle how it formed and developed ... The inner core is responsible for Earth's magnetic field, which acts like a shield, protecting us from harmful ...

In the case of our 'string around the Earth' puzzle, the radius is being increased by 15cm, so we need to know that as a fraction of the original radius. So what is the radius to start with?

The world has experienced an extraordinary surge in heat, catapulting the climate system into uncharted territory.

"The details of this big event are still a bit of a mystery, but we've added another piece of the puzzle when it comes to our knowledge of the Earth's inner core." These findings may explain why ...