Hubble observations of Ganymede, Teleconference on March 12, 2015 Options

[TheAnt]

Right, left??? Which way around depends on whether you plot wavelength or frequency on the horizontal axis, and even then if you choose to plot values in ascending or descending order. Maybe we should stick to SI units rather than an entirely anthropocentric reference frame.


The low-pressure form of water ice is always less dense than liquid water, regardless of temperature, so cannot founder into the subsurface as cold oceanic slabs do into the Earth's mantle.

You're right that there's no consensus on how to plot the electromagnetic spectrum. In my native language however the longer wavelengths are usually referred to as 'the right end' whereas it in English is called 'the far end' of the spectrum.

Now in regard to the question by Julius - there have been quite a number of papers where the grooved terrain on Ganymede have been interpreted as signs of present or past tectonic activity. I did see one such paper some year back, now when writing this reply I googled it and found the idea dates back to the images taken by the Voyager. And again when images by Galileo were studied where Arbela Sulcus was mentioned as one example.

Then again, now that we're anthropocentric this could also be described as ice sheets floating on water, however planetary scientists it is usually referred to as tectonics. So lets say 'ice tectonics' to make it clear, and then the answer is yes both for Ganymede as well as Europa.