THOSE who look for intelligent life on other planets usually confine their efforts to listening for radio signals from stars that are, on the cosmic scale of things, fairly close by. The resounding silence so far does not deter enthusiasts, who point out that there are 100 billion stars in Earth's home galaxy, the Milky Way, almost all of which have not yet been examined. He who lives by the billion, however, may also die by it. For another number measured in billions is the Milky Way's age in y...
THOSE who look for intelligent life on other planets usually confine their efforts to listening for radio signals from stars that are, on the cosmic scale of things, fairly close by. The resounding silence so far does not deter enthusiasts, who point out that there are 100 billion stars in Earth's home galaxy, the Milky Way, almost all of which have not yet been examined. He who lives by the billion, however, may also die by it. For another number measured in billions is the Milky Way's age in y...
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