Aurora Borealis light up much of UK and Ireland, from Orkney and Donegal to southern England
The northern lights over Stonehenge in Wiltshire on Saturday evening. This image consists of two photos, a 16-second exposure of the sky and a two-minute exposure of the foreground, merged together to reveal more detail than what the naked eye can see in darkness.The northern lights over Stonehenge in Wiltshire on Saturday evening.
“Northern Lights over Stonehenge last night,” read a post by the official Twitter account for the Wiltshire historical centrepiece, which was accompanied by a photograph.The light spectacle is usually most visible near Earth’s magnetic north and south poles, where the lights are called the aurora australis.
They are caused by the interaction of particles coming from the sun, known as the solar wind. These particles can travel millions miles, with some eventually reaching the Earth. They are then channelled to the polar regions by Earth’s magnetic field. Depending on which gas molecules are hit and where they are in the atmosphere, different amounts of energy are released as different wavelengths of light, with oxygen producing green light and nitrogen causing the sky to glow red.Though light pollution makes the aurora difficult to see, some photographers still managed to capture the spectacle while documenting firework displays to mark bonfire weekend.
It was the Italian astronomer Galielo Galiliei who coined the name Aurora Borealis in 1619, after the Roman goddess of dawn, Aurora, and the Greek god of the north wind, Boreas.
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