Solar halo over Mexico City

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A solar halo in Mexico City

    
A solar halo appeared in Mexico City on Thursday - prompting dozens of calls from worried locals to meteorologists.

The phenomenon, which is actually an optical illusion, is caused when sunlight passes through ice crystals, causing the light to bend into a colourful ring.

Not satisfied with this scientific explanation, locals on social media claimed that an alien invasion was nigh, while other conspirators suggested the government was attempting to blind voters ahead of an election.

The halo was spotted in three cities, most notably above the capital's most famous landmark, the Angel of Independence.

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