So even if our exposure time is indeed nearly a trillionth of a second, to get sufficient light we must take an average.

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Nor is standard photographic equipment always sufficient, since urban light pollution can wreck an image of a supernova.

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But the London-based watchdog said it now accepted there was sufficient benefit to justify a green light for the worst-affected patients, on condition that those receiving the one-off therapy continued to be followed.

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If the Fed tightens early, though, then a light tap on the brakes will be sufficient.

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Not just the obvious basics such as sufficient resources of food and water, even the simple light bulb poses a problem.

ENGADGET: Alt-week 12.08.12: The oldest known dinosaur, lighting up a space station and the black marble

Because the rims of these craters catch rays of light from the sun, this may provide sufficient illumination for the spectrometer to detect frozen water.

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When its engines light, hold-down clamps keep it in place until it has built up sufficient thrust.

CNN: Victory Lap