Fig. 3: A catastrophic disruption can be at the origin of thermal alteration.

a Stereoscopic pair at time t = 0 of the gravitational phase of the disruption of the parent body for simulation 3 (see Supplementary Movie 1). The peak temperature change for each particle from the impact is shown (see also Fig. 5) with colors scaling from 10 K (blue) to 1000 K (red). b Stereoscopic pair of the gravitational reaccumulation of the largest remnant (see Supplementary Movie 2) at t = 4.75 hours, exhibiting filamentary structure that will eventually collapse into a single aggregate. Other smaller filaments will escape and collapse to form smaller aggregates. This stereoscopic pairs in the Supplementary Movies can be viewed in ‘parallel’ stereo mode simply by relaxing the eye convergence. We suggest to view the pair of images from a foot or so away, and look through the screen to infinity, allowing the two images to float across each other. Where the two central pictures exactly overlap, the ‘fused’ 3-D image is to be found; all that is then necessary is to gently adjust the focus of the eyes, while the convergence remains relaxed, to obtain a clear stereoscopic image. This technique is called ‘Free Viewing’ of stereo pairs. For a more authentic stereo effect, use a Brewster format stereoscope — The London Stereoscopic Company OWL or similar. Detailed instructions may be found at LondonStereo.com.