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What do you think of when you hear talk of the word ‘halo’?

file9471277412078To some, it’s a futuristic military science fiction video game of interstellar war between humanity and an alliance of aliens, in which halos are large habitable structures designed to destroy all sentient life.  For those who enjoy gazing at the stars rather than the screen, the word may bring to mind circular bands of coloured light around a sun or moon, which, those with scientific minds will know, are caused by the refraction and reflection from ice particles suspended in the atmosphere; to read more click here.