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Old 18-06-2016, 11:49 PM
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janoskiss (Steve H)
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Join Date: Jan 2005
Location: Sale, VIC
Posts: 6,033
The science is all explained at Sixty Symbols (no spoilers): https://youtu.be/bHVkR3s9KX0

Long version at Deep Sky Videos: https://youtu.be/JKrn4P4c5ps
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