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UID:98691
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DTSTART;TZID=America/New_York:20231208T110000
DTEND;TZID=America/New_York:20231208T120000
URL;TYPE=URI:https://wpiedudev.wpi.edu/news/calendar/events/mathematical-sc
 iences-department-colloquium-andrew-prentice-monash-university-modern-lapl
 acian
SUMMARY:Mathematical Sciences Department Colloquium - Andrew Prentice, Mona
 sh University "The Modern Laplacian Theory for the Formation of our Solar 
 System – 50 years on!" (IS 203)
DESCRIPTION:\n\n\n      \n      \n\n\n\nMathematical Sciences Department\nC
 olloquium\nSpeaker: Andrew Prentice, Monash University\nFriday, December 8
 , 2023\n11:00 am - 12:00 pm\nInnovation Studio 203\nTitle: The Modern Lapl
 acian Theory for the Formation of our Solar System – 50 years on!Abstract:
  In this colloquium, I first give a brief overview of the broad physical, 
 chemical and orbital characteristics of our Solar system that have been gl
 eaned from Earth-based observations and interplanetary spacecraft missions
 . It is these characteristics that throw light on the physical and chemica
 l processes that were at work during the system’s formation. Next, I put f
 orward a fully quantified version of the Laplace’s nebula hypothesis. Lapl
 ace (1796) proposed that the planetary system had condensed from a discret
 e family of orbiting gas rings that were cast off from the contracting pro
 tosolar cloud. These rings were shed as a means for disposing of excess sp
 in angular momentum during radial contraction. The modern Laplacian Theory
  (MLT) overcomes all of the objections that led to the abandonment of the 
 original hypothesis. It provides a pathway to understanding much of the ob
 served structure of the planetary system, as well as that of the regular s
 atellite systems of Jupiter and Saturn (Prentice 1978, Moon and Planets 19
  341; 2001 Earth, Moon Planets 87 11; 2016 PASA 23 1). The shedding of dis
 crete gas rings comes about as a result of very powerful thermal convectio
 n within cloud’s interior. A very steep temperature inversion in the outer
  layers of the cloud, due to the curtailment of convection heat transfer a
 t the surface, leads to creation of a dense outer shell of non-turbulent g
 as. As a consequence, the contracting cloud rids excess spin angular momen
 tum in discrete amounts, thus producing a system of isolated and nearly ge
 ometrically-spaced gas rings, one corresponding to the orbit of each plane
 t. The end-members of our planetary system, namely Mercury and Pluto play 
 a crucial role in calibrating the MLT. I explain how Mercury came to acqui
 re its huge store of iron and nickel (~70% by mass), how the Pluto-Charon 
 binary system may have formed by the rotational fission of a single liquid
  globe, and how the KBO Arrokoth acquired its flattened bilobate shape (DO
 I: https://doi.org/10.1002/essoar.10501732.1)\n
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