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.
This article appeared in the Science & technology section of the print edition under the headline "Infra digging"
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