The relationship between stellar rotation and tracers of magnetic activity is therefore an important probe of the stellar dynamo. In solar-type stars, X-ray emission is observed to increase ...

But the Moon is too small to support that type of dynamo, according to Christina Dwyer, a graduate student in Earth and planetary sciences at the University of California, Santa Cruz. The presence ...

a generator consisting of a coil (the armature) that rotates between the poles of an electromagnet (the field magnet) causing a current to flow in the armature The word dynamo has appeared in 32 ...