At the kick off for the new Merkinch Nature Reserve astronomy programme tonight, I got to talk about one of my favourite planets of all time – Saturn and its mind blowing ring system.
The dynamics of the rings are so subtle and complex. Some of the gaps in the rings are made by moonlets clearing paths, whilst other moons are actually replenishing the rings.
The small moon Enceladus is a fascinating example. It’s spewing out frozen ice from its south pole due to tidal heating, effectively generating Saturn’s faint E ring (the faint blue outer ring pictured above).
You could sit on a moonlet of Saturn and watch the rings forming little wavelets in real time around you. Some of the larger rings actually wash back and forth like waves on a giant ocean.
Many of the smaller moonlets orbiting Saturn have a polished or smooth aspect to them. This is due to fine particulates from the rings being drawn towards them due to gravity, effectively power coating the surface and covering over any craters or blemishes. This accretion of material onto the moons has been imaged by Cassini.
We had great turnout for the kickoff. The next event is a Moon special on Nov 7th. Look out for eventbrite links here on on my Facebook page.