Cryptodiamond

On 2017-12-11 at 9:33 AM, Janus said:

While a supernova would scatter elements into the galaxy, I doubt any of it would reach another galaxy.

As far as heavy elements in the inner planets go, Earth has a density of 5.52 g/cm³, Venus 5.24 g/cm³, and Mercury 5.43 g.cm³ .

Earth has the highest density, but is also the largest. This becomes a factor because as a  rocky planet gets larger, the pressure at its interior increases, which compresses the core and brings up the average density of the planet. 

2

Also recall, Earth has the moon which is considered special, the current paradigm has a Mars size planet hitting Earth, donating much of its iron core and forming out of the debris, I have not seen much discussion on it but would this not increase the density of Earth compared to Mars and Venus? 

Tim 

I am not sure I can see the lakes, I can see two ice streams that appear to be falling into a gorge, with tarn like terminations. Is that them?