Last night the northern lights, or aurora borealis, were widely visible in the UK, much further south than usual. I missed out, either because of light pollution in the city centre, or perhaps because they just weren't visible here, but many others were lucky, as even a brief glance at Twitter will show.
In 793, according to the Anglo-Saxon Chronicle, there were seen fyrene dracen on þam lyfte fleogende 'flaming dragons flying in the air' and it is very plausible that this is a description of the northern lights. As we all know, that description was followed by the notorious Viking raid on Lindisfarne. So it seems appropriate that we can see the aurora borealis here just a few days before the Vikings: Life and Legend exhibition opens at the British Museum.