<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style>
</head>
<body dir="ltr">
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
Hello all,</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif;" class="elementToProof">
<span style="font-size: 12pt; color: rgb(0, 0, 0);">Reminder that PLS is tomorrow (</span><span style="font-size: 16px; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);"><b>Tuesday, October 7 at 12:30 pm in 54-517</b></span><span style="font-size: 12pt; color: rgb(0, 0, 0);">)
given by Dr. </span><span style="font-size: 12pt; color: black; background-color: rgb(255, 255, 255);">Zhongtian Zhang!</span></div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: black;" class="elementToProof">
<span style="background-color: rgb(255, 255, 255);"><br>
</span></div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: black;" class="elementToProof">
<span style="background-color: rgb(255, 255, 255);">Please sign up to meet with Dr. Zhang
<a style="margin: 0px; background-color: rgb(255, 255, 255); text-align: left;" data-auth="NotApplicable" data-linkindex="0" rel="noopener noreferrer" title="https://docs.google.com/spreadsheets/d/1sqJhj52gT8X83b67SDM4XJsRzH5dVMRfe5FnuPPjJmQ/edit?usp=sharing" class="x_OWAAutoLink elementToProof" id="OWAad726b35-c0c7-d0b4-47c7-138845abdd29" target="_blank" href="https://docs.google.com/spreadsheets/d/1sqJhj52gT8X83b67SDM4XJsRzH5dVMRfe5FnuPPjJmQ/edit?usp=sharing">
here</a>.</span></div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: black;" class="elementToProof">
<span style="background-color: rgb(255, 255, 255);"><br>
</span></div>
<div style="text-align: left; text-indent: 0px; background-color: rgb(255, 255, 255); margin: 0px; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: black;" class="elementToProof">
Best,</div>
<div style="text-align: left; text-indent: 0px; background-color: rgb(255, 255, 255); margin: 0px; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: black;" class="elementToProof">
Isaac and the PLS Organizing Committee</div>
<div style="text-align: left; text-indent: 0px; background-color: rgb(255, 255, 255); margin: 0px; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: black;" class="elementToProof">
<br>
</div>
<div style="text-align: left; text-indent: 0px; background-color: rgb(255, 255, 255); margin: 0px; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: black;" class="elementToProof">
--------------------</div>
<div style="text-align: left; text-indent: 0px; background-color: rgb(255, 255, 255); margin: 0px; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: black;" class="elementToProof">
<b><br>
</b></div>
<div style="text-align: left; text-indent: 0px; background-color: rgb(255, 255, 255); margin: 0px; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: black;" class="elementToProof">
<b>Planetesimal evolution: Collisions, differentiation, and magnetic field generation</b></div>
<div style="text-align: left; text-indent: 0px; line-height: 1.38; background-color: rgb(255, 255, 255); margin: 0in 0in 8pt; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: black;" class="elementToProof">
<b><br>
</b></div>
<div style="text-align: left; text-indent: 0px; line-height: 1.38; background-color: rgb(255, 255, 255); margin: 0in 0in 8pt; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: black;" class="elementToProof">
<b>Abstract: </b>Planetesimals, typically hundreds to thousands of kilometers in size, are the fundamental building blocks of planets. Understanding their evolution is crucial for interpreting meteorite records and for elucidating the processes of planet formation.
Most previous models considered planetesimals as isolated objects, overlooking the role of their mutual collisions. In this talk, I will present my recent work on planetesimal differentiation and magnetic field generation, using them to illustrate the potential
effects of collisions on planetesimal evolution. Looking ahead, I will discuss how collisions may be key to resolving long-standing questions regarding iron meteorite compositions and volatile depletions in planetary bodies.</div>
<div style="text-align: left; text-indent: 0px; background-color: rgb(255, 255, 255); margin: 0px; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: black;" class="elementToProof">
<br>
</div>
<div id="appendonsend"></div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Isaac Narrett <narrett@mit.edu><br>
<b>Sent:</b> Wednesday, October 1, 2025 12:24 PM<br>
<b>To:</b> baps <baps@mit.edu>; mitexoplanets <mitexoplanets@mit.edu>; planetary <planetary@mit.edu><br>
<b>Subject:</b> PLS - Tuesday Oct 7th - Dr. Zhongtian Zhang</font>
<div> </div>
</div>
<style type="text/css" style="display:none">
<!--
p
{margin-top:0;
margin-bottom:0}
-->
</style>
<div dir="ltr">
<div class="x_elementToProof" style="text-align:left; text-indent:0px; background-color:rgb(255,255,255); margin:0px; font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt; color:black">
Dear planet enthusiasts,</div>
<div class="x_elementToProof" style="text-align:left; text-indent:0px; background-color:rgb(255,255,255); margin:0px; font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt; color:black">
<br>
</div>
<div class="x_elementToProof" style="text-align:left; text-indent:0px; background-color:rgb(255,255,255); margin:0px; font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt; color:black">
We're excited to announce that the next Planetary Lunch Seminar will be presented by Dr. Zhongtian Zhang! Join us on
<b>Tuesday, October 7 at 12:30 pm in 54-517</b> or on Zoom. Lunch will be provided, and we encourage you to arrive a few minutes early to get food.</div>
<div class="x_elementToProof" style="text-align:left; text-indent:0px; background-color:rgb(255,255,255); margin:0px; font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt; color:black">
<br>
</div>
<div class="x_elementToProof" style="text-align:left; text-indent:0px; background-color:rgb(255,255,255); margin:0px; font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt; color:black">
Please sign up to meet with Dr. Zhang <a title="https://docs.google.com/spreadsheets/d/1sqJhj52gT8X83b67SDM4XJsRzH5dVMRfe5FnuPPjJmQ/edit?usp=sharing" class="x_OWAAutoLink" id="OWAb17914fb-1f0d-bc27-2603-9faf72dbc01e" href="https://docs.google.com/spreadsheets/d/1sqJhj52gT8X83b67SDM4XJsRzH5dVMRfe5FnuPPjJmQ/edit?usp=sharing">
here</a>.</div>
<div class="x_elementToProof" style="text-align:left; text-indent:0px; background-color:rgb(255,255,255); margin:0px; font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt; color:black">
<br>
</div>
<div class="x_elementToProof" style="text-align:left; text-indent:0px; background-color:rgb(255,255,255); margin:0px; font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt; color:black">
A talk title, abstract, and Zoom information can be found below.</div>
<div class="x_elementToProof" style="text-align:left; text-indent:0px; background-color:rgb(255,255,255); margin:0px; font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt; color:black">
<br>
</div>
<div class="x_elementToProof" style="text-align:left; text-indent:0px; background-color:rgb(255,255,255); margin:0px; font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt; color:black">
Best,</div>
<div class="x_elementToProof" style="text-align:left; text-indent:0px; background-color:rgb(255,255,255); margin:0px; font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt; color:black">
Isaac and the PLS Organizing Committee</div>
<div class="x_elementToProof" style="text-align:left; text-indent:0px; background-color:rgb(255,255,255); margin:0px; font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt; color:black">
<br>
</div>
<div class="x_elementToProof" style="text-align:left; text-indent:0px; background-color:rgb(255,255,255); margin:0px; font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt; color:black">
--------------------</div>
<div class="x_elementToProof" style="text-align:left; text-indent:0px; background-color:rgb(255,255,255); margin:0px; font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt; color:black">
<b><br>
</b></div>
<div class="x_elementToProof" style="text-align:left; text-indent:0px; background-color:rgb(255,255,255); margin:0px; font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt; color:black">
<b>Planetesimal evolution: Collisions, differentiation, and magnetic field generation</b></div>
<div class="x_elementToProof" style="line-height:1.38; margin:0in 0in 8pt; font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt; color:black">
<b><br>
</b></div>
<div class="x_elementToProof" style="line-height:1.38; margin:0in 0in 8pt; font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt; color:black">
<b>Abstract: </b>Planetesimals, typically hundreds to thousands of kilometers in size, are the fundamental building blocks of planets. Understanding their evolution is crucial for interpreting meteorite records and for elucidating the processes of planet formation.
Most previous models considered planetesimals as isolated objects, overlooking the role of their mutual collisions. In this talk, I will present my recent work on planetesimal differentiation and magnetic field generation, using them to illustrate the potential
effects of collisions on planetesimal evolution. Looking ahead, I will discuss how collisions may be key to resolving long-standing questions regarding iron meteorite compositions and volatile depletions in planetary bodies.</div>
<div class="x_elementToProof" style="text-align:left; text-indent:0px; background-color:rgb(255,255,255); margin:0px; font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt; color:black">
Zoom link: <a data-linkindex="0" title="https://mit.zoom.us/j/97275591700" class="x_ms-outlook-linkify x_OWAAutoLink" id="OWA4a2e1d92-40c8-a8a4-e706-2c0fc806eff9" target="_blank" href="https://mit.zoom.us/j/97275591700" style="margin:0px">
https://mit.zoom.us/j/97275591700</a><br>
PW: 54100</div>
<div class="x_elementToProof" style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
</div>
</body>
</html>