News

Earth

Hurricane Dorian’s slow pace makes it dangerous and hard to predict

Hurricane Dorian is one of several recent hurricanes that moved extremely slowly. Whether that's due to climate change isn't yet clear.

Space

Iron sulfide may be keeping Mercury’s core toasty and its magnetic field alive

New estimates of how much heat Mercury’s core loses could explain why the tiny world has a long-lived magnetic field.

Earth

How ancient oceans of magma may have boosted Earth’s oxygen levels

Chemical reactions involving iron could have increased the amount of oxygen-rich compounds in the early Earth’s mantle, lab experiments suggest.

Space

Overnight changes in Mars’ atmosphere could solve a methane mystery

Overnight atmospheric changes on Mars can explain why two spacecraft measure vastly different concentrations of methane.