Blue and Green: After a 30 metre mystery crater was discovered in July by a helicopter pilot, many in the scientific community have been confused by its appearance. There have been suggestions of a missile explosion, meteorite and of course alien claims. However, Russian scientists have now said the most likely cause is linked to abnormally hot summers.
The large crater was found in the Yamal peninsula in Siberia and researchers suggest it was caused by methane being released from thawing permafrost.
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