2020 - 2021 session

The University lecture rooms remain closed, and so the following meetings

will be held via video using the  Zoom system

13 April: Prof. Tim Elliott (University of Bristol) - Recipes for Making the Earth

The main ingredients usually invoked to make planets are primitive meteorites, the chondrites. Although believed to be broadly representative of the solar disk from which planets grew, there are subtle differences in the compositions of different chondrite groups. An important question has therefore been what quantities of the different chondrites are needed to make the Earth. It transpires that one answer is obtained by considering elemental compositions and another using their isotopic characteristics. I argue that this dilemma is resolved if elemental abundances are modified by vapour loss as a natural consequence of the energetic process of collisional planetary accretion. So overall, a respectable Earth can be made from a starting composition of enstatite chondrite that has been wantonly over-cooked.

 

 

 

11th May: Annual General Meeting

 

 

 

 

 

Please login into the zoom system between 7 and 7.25 pm, as once the lecture starts it is difficult for Judy to keep track of the talk, waiting room and zoom messages.

Other dates yet to be confirmed

        

WEGA members will be emailed with the invitation to each of these zoom meetings separately