Mike Brown's Planets, season 4: sabbatical |
Mike Brown's Planets, season 4: sabbatical |
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![]() Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 ![]() |
Now on sabbatical, Mike Brown has recently reactivated his mainly Transneptunian blog. Here is a tasty two-parter on Sedna for starters: http://www.mikebrownsplanets.com/2010/10/t...ere-part-2.html
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![]() Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 ![]() |
The essence of that article and the linked paper is that you can't make a large rocky body by assembling many small icy ones.
Here's a go at that problem. Start with a population of small particles, mostly silicate (rockdust), some ice. Suppose that rock-rock collisions are very bad at resulting in coalescence whereas ice-ice and ice-rock collisions do so more easily due to the absorption of energy by plastic deformation and partial melting. The rock particles would never find a permanent home until they ran into an already formed icy object. As the object grows it becomes better and better at trapping the ubiquitous rockdust. |
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