Earth and Venus

Jovan sent in this link – www.skyandtelescope.com/astronomy-news/why-is-earth-magnetized-and-venus… … why is Earth magnetised but Venus is not magnetised. It seems planetary scientists don't really know what to make of Venus, an admission in a popular magazine available for sale in newsagents. It is in many ways similar to the Earth in matters os size, mass, and rocky composition – but worlds apart in other ways. In atmosphere for example. Venus is cl;oud rich and dense. Surface temperatures are around 460 degrees celsius. Based on its density Venus must have an iron rich core, we are told – so why does it lack a magnetic field? There follows an attempt to explain – and one is left wondering.