* Astronomy

Scientists say they have seen one of the fastest evolutionary changes ever observed in a species of butterfly.
The tropical Blue Moon butterfly has developed a way of fighting back against parasitic bacteria.
Six years ago, males accounted for just 1% of the Blue Moon population on two islands in the South Pacific.
But by last year, the butterflies had developed a gene to keep the bacteria in check and male numbers were up to about 40% of the population.
Scientists believe the comeback is due to "suppressor" genes that control the Wolbachia bacteria that is passed down from the mother and kills the male embryos before they hatch.

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