View Full Version : Neutrons Stars Have Crusts of Super-Steel

2009-May-06, 09:10 PM
Neutron stars are dying stars that are seemingly ‘off the charts’ in almost every category. They are small and extremely dense; about 20 km in diameter with masses of about 1.4 times that of our Sun, meaning that on Earth, one teaspoon of a neutron star would weigh about 100 million tons. They [...]

More... (http://www.universetoday.com/2009/05/06/neutrons-stars-have-crusts-of-super-steel/)

2009-May-07, 03:44 AM
This I didn't understand. If neutron stars have a crust then that implies a mantle and a core, but what phase transition can neutronium perform? I thought that was the ultimate state of matter and a star of such would be homogenous in its structure due to all that g.
Someone, put me straight, please.


2009-May-07, 03:56 AM
Welcome to BAUT Forum.

If neutron stars have a crust then that implies a mantle and a core [...]

See Wikipedia: Neutron star :: Structure (http://en.wikipedia.org/wiki/Neutron_star#Structure)

On the basis of current models, the matter at the surface of a neutron star is composed of ordinary atomic nuclei as well as electrons. [..] Proceeding deeper, one comes to a point called neutron drip where free neutrons leak out of nuclei. In this region, there are nuclei, free electrons, and free neutrons. The nuclei become smaller and smaller until the core is reached, by definition the point where they disappear altogether.

2009-May-07, 04:16 AM
Whilst I normally prefer tailored answers, I thank you for the reference, which continues:

While this theoretical substance is referred to as neutronium in science fiction and popular literature, the term "neutronium" is rarely used in scientific publications, due to ambiguity over its meaning.
This perfectly illustrates my over-reliance on pulp sci-fi in the absence of a proper education.

2009-May-07, 10:54 AM
Welcome to BAUT Forum.

See Wikipedia: Neutron star :: Structure (http://en.wikipedia.org/wiki/Neutron_star#Structure)

01. Yep, and the shape of the nucleons shifts,too as you go deeper, from spherical to ellipsoidal, as indicated by the close packing models. pete