Date: 13/09/2015 08:00:56
From: Spiny Norman
ID: 774773
Subject: More Pluto images
It’s a pleasingly varied topography.
It’s a pleasingly varied topography.
Still want to know about those polygonal shapes
Haircut tomorrow. I’ll ring her at 10 to ask if the appointment was for 11 or 12, as there’s some confusion regarding this point.
Bubblecar said:
Haircut tomorrow. I’ll ring her at 10 to ask if the appointment was for 11 or 12, as there’s some confusion regarding this point.
Hmm, sorry.
dv said:
Still want to know about those polygonal shapes
Do a Google Image search for “Ice Polygons” to find a dozen or so similar formations on Earth.
https://www.google.com.au/search?q=ice+polygons&tbm=isch
For one possible explanation see http://permafrosttunnel.crrel.usace.army.mil/permafrost/patterned_ground.html
“polygons occur from contraction of the soil from water loss through evaporation and/or coldness. The contraction is forceful enough that the ground cracks in a polygon pattern in order to release tensile stress.”