The uppermost parts of its thick cloud layer mysteriously absorb half of the ultraviolet light received by the planet.

ECONOMIST: Planetary science

The closer they got to Poway, the thick cloud of smoke turned the sky as dark as pitch black night.

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And if conditions on Wednesday are at all similar to Tuesday, which featured thick cloud throughout to help provide lavish sideways movement, Australia's seam bowlers will be expected to hit back hard.

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Despite his hopes for Saturday's first session, Finn said it was "obviously frustrating" that England were not able to take the new ball with thick cloud cover overhead on Friday evening as the umpires ruled the light had become too poor.

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After analysing an unusual but temporary increase in Titan's brightness, Dr Griffith concluded that the most likely explanation was the presence of a thick, reflective cloud, covering roughly 9% of the part of Titan's surface then visible from earth.

ECONOMIST: Comparative meteorology