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Credit: NAOJ The universe is a big place, and by peering across it astronomers get to look back in time . A galaxy or supernova so far away that it takes two billion years for its light to reach us will be seen here as it appeared two billion years ago. Remarkably, today s best telescopes can look across the majority of cosmic time, spying on galaxies as they looked just hundreds of millions of years after the big bang.

In about 100 milliseconds, horseshoe bats can alter his ear shape significantly in ways that would suit different acoustic sensing tasks. A blink of the eye takes two to three times longer.