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NASA， the U.S. space agency， believes there‘s a good chance that we‘re not alone in the universe. Last fall， NASA began a new project called the High Resolution Microwave Survey . Its aim: to find evidence of life in one of the billions of galaxies in the universe.

The search for intelligent life on other planets isn‘t new. It began almost 100 years ago. That‘s when scientists built a huge transmitter to send radio waves into space. Scientists thought smart beings on other planets might pick up the signals.

Scientists also have sent a message about humans and our solar system to a nearby constellation . But because the constellation is 25，000 light years away， a return message wouldn‘t reach Earth for 50，000 years! So don‘t wait up for an answer.

So far， no extraterrestrial beings that we know of have returned our “ calls. ” But according to Dr. Jill Tarter， an HRMS scientist， we haven‘t exactly had our ears wide open. “ Now， however， ” says Dr. Tarter， “ we‘ve built the tools we need to listen well.”

Last October， Dr. T

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