The latest findings of the spacecraft Galileo, which has been providing valuable information about Jupiter and its satellites, relate to moon Callisto. The satellite shows no evidence of an internal magnetic field and is unlike the other satellites of Jupiter such as Io, Europa and Ganymede. In other satellites, the field is assumed to come from an internal molten core which formed when the moon was hot enough for ice, rock and metal to separate. The absence of a magnetic field on Callisto could mean that it is uniformly dense ( Nature , Vol 387, No 6630).
We are a voice to you; you have been a support to us. Together we build journalism that is independent, credible and fearless. You can further help us by making a donation. This will mean a lot for our ability to bring you news, perspectives and analysis from the ground so that we can make change together.
Comments are moderated and will be published only after the site moderator’s approval. Please use a genuine email ID and provide your name. Selected comments may also be used in the ‘Letters’ section of the Down To Earth print edition.