What does polarization mean?

Video on polarized gamma-ray emission from the Crab Nebula

A short didactic video (1'50") on polarization and how it has been used to study the "Polarized gamma-emission from the Crab", article by Professor Tony Dean (Southampton University, UK - on the left) et al. published in Science on August 29, 2008.

Features John B. Stephen (INAF-IASF Bologna) and Pietro Ubertini (INAF-IASF Roma).

INAF press release: Identificata l'origine dell’emissione ad alte energie della Nebulosa del Granchio

Credits for the video: Marco Malaspina and Stefano Parisini, Ufficio comunicazione Inaf, 2008.