A Caltech Library Service

Onions or Plum Puddings?

Stevenson, David J. (1983) Onions or Plum Puddings? Engineering and Science, 46 (3). pp. 16-21. ISSN 0013-7812.

PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


One recipe in the Betty Crocker guide to planets might feature the liliaceous herb of the genus Allium pictured above - the onion. This onion is layered, and it is possible that the concentric layers may be similar to the distribution of material within a planet dictated by gravity. An alternative planetary structure might be more like a plum pudding, which has a matrix with inclusions of a material of a different composition. If you have ever tried to make a structure like this, you know that if you make the mixture too runny, the raisins will settle out before the cooking process "lithifies" the matrix and causes the raisins to stay in place.

Item Type:Article
Related URLs:
URLURL TypeDescription
Stevenson, David J.0000-0001-9432-7159
Additional Information:© 1983 California Institute of Technology.
Issue or Number:3
Record Number:CaltechAUTHORS:20131125-094138089
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42681
Deposited By: Tony Diaz
Deposited On:25 Nov 2013 18:11
Last Modified:03 Oct 2019 06:00

Repository Staff Only: item control page