* Astronomy

Archaeologists working amid the smog and din of Mexico City may be on the verge of unlocking an extraordinary time capsule.
The leaders of a team exploring a site opened up by earthquake damage believe that they have found the first tomb of an Aztec ruler. If they are right the site may yield one of the great treasures of antiquity, the sort of haul that fires the imagination of people far beyond academic circles.
None of the finds has been put on public display but Britain will get an early preview. Fourteen gold objects from the site will feature in the British Museum's exhibition on Moctezuma II, the last great Aztec ruler. These could prove to be the early pickings of a much richer harvest.

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