Venus' changing rotation rate?

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Venus' changing rotation rate?

Post by Sirius_Alpha on 10th February 2012, 6:31 pm

http://www.universetoday.com/93494/is-venus-rotation-slowing-down/

Thoughts?

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Re: Venus' changing rotation rate?

Post by PlutonianEmpire on 11th February 2012, 3:20 am

Venus does have a retrograde rotation while being in a prograde orbit, so, might the sun be playing a role in it too?

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Re: Venus' changing rotation rate?

Post by Sirius_Alpha on 11th February 2012, 1:06 pm

It alone shouldn't be working this fast though. 6.5 minutes in the course of 20 years is obscenely fast.

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Re: Venus' changing rotation rate?

Post by Lazarus on 11th February 2012, 8:58 pm

The effect of the Venusian atmosphere on the rotation is definitely something interesting to look into. As I understand it, even if Venus were prograde, thermal tides in the atmosphere would prevent capture into the 1:1 spin/orbit resonance.
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Re: Venus' changing rotation rate?

Post by Sunchaser on 12th February 2012, 9:31 am

Here's my uninformed opinion/observation...
I heard that the Chilean quake affected Earth's rotation...could recent tectonic activity on Venus be a possible cause?

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Re: Venus' changing rotation rate?

Post by Sirius_Alpha on 12th February 2012, 5:00 pm

The thought crossed my mind, but the quakes on Earth don't seem to affect our rotation period by more than a few milliseconds or so (or was it microseconds?). I can't imagine what kind of activity would be required for Venus to lose 6.5 minutes. Another thing to consider is that Venus does not appear very geologically active today.

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Re: Venus' changing rotation rate?

Post by PlutonianEmpire on 12th February 2012, 7:48 pm

Does that include volcanic activity?

Also, if this loss were constant, meaning the rate of loss is the same for however long it's been since it started, then how long ago might Venus have had an Earthlike rotation period of about 24 hours?

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