TROHESE DAYS do the most amazing things. If someoruck a mat the Moon, they could spot the flare. From the tihrobs and wobbles of distant starsthey ihe size and character and even potential habitability of plas muote to be seen—plas so distant that it would take us half a million years in a spaceshipto get there. With their radio telescopes they capture wisps of radiation so preposterouslyfaint that the total amount of energy collected from outside the solar system by all of themtogether since colleg began (in 1951) is “less than the energy of a single snowflakestriking the ground,” in the words of Carl Sagan.
In short, there isn’t a great deal that goes on in the universe that astronomers ’t fihey have a mind to. Which is why it is all the more remarkable to reflect that until 1978no one had ever noticed that Pluto has a moon. In the summer of that year, a youngastronomer named James Christy at the U.S. Naval Observatory in Flagstaff, Arizona, w……（内容加载失败！）
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