TRONOMERS THESE DAYS can do the most amazing things. If someone struck a matchon the Moon, they could spot the flare. From the tiniest throbs and wobbles of distant starsthey can infer the size and character and even potential habitability of planets much tooremote to be seen—planets so distant that it would take us half a million years in a spaceshipto get there. With their radio telescopes they can capture wisps of radiation so preposterouslyfaint that the total amount of energy collected from outside the solar system by all of themtogether since collecting began (in 1951) is “less than the energy of a single snowflakestriking the ground,” in the words of Carl Sagan.

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