By comparing their results to different models of the Earth's interior, Professor Tkalčić and Dr Ma found that this was best explained by the presence of a vast underground 'torus', or donut ...

So why do these waves slow down in the donut-shaped region we found? We think there must be a higher concentration of light elements in this region. These may be released from Earth's solid inner ...

Two bands of radiation called the Van Allen belts encircle Earth. After a May 2024 solar superstorm, two more showed up between those belts.