PDA

View Full Version : The Dynamo of Venus



RalofTyr
2009-Feb-15, 10:14 PM
Is the reason Venus lacks a magnetic field is due to a lack of rotation speed rather than a lack of a molten core?


Is Venus still volcanically active?

Does or did Venus ever have plate tectonics?

Tobin Dax
2009-Feb-15, 10:54 PM
Yes, Venus' rotation is too slow to create a significant dynamo effect.

Venus is about the size and mass of Earth, and is still warm enough to have a molten core. It's geologically active and has a lot of coronae, bulging pockets of magma, as well as shield volcanoes.

Venus doesn't have crustal plates, and so there's not plate tectonics. Only Earth seems to have any tectonic activity. Venus' crust seems to be pretty young, though. The reining theory is that is the crust broke up and reformed at least once in the planet's history.

Nine Planets (http://www.nineplanets.org) should have more information if you want to check it out.

EDG
2009-Feb-15, 11:38 PM
One reason is the slow rotation. The other likely reason is that Venus' core is entirely molten and stable to convection, which means that it can't generate a magnetic field.