Here's what's on the golden record, NASA's message to aliens carried by the Voyager probes

Sagan's team created the greatest puzzle of all time, which you can only solve if your species understands the basic nature ...
来自MSN

Is this why we haven't found aliens? Scientists claim looking for planets with water is ...

Scientists hunting for life beyond Earth have long thought that water is one of the key indicators. But a group of experts now says that looking for life on water–rich planets could be a waste of time ...