Assertion: pulsar's surface | /r/MadeOf | iron
Facets:
Source sentences:
text: A magnetar is thought to consist of a superdense core of neutrons surrounded by a rigid crust of atoms about a mile deep with a surface made of iron.
text: A magnetar is thought to consist of a superdense core of neutrons surrounded by a rigid crust of atoms about a mile deep with a surface made of iron.