The first thing an alien race is likely to hear from Earth is chirps and whistles, a bit like R2-D2, the robot from Star Wars. In reality, they are the sounds that accompany the aurora. Now ESA?s Cluster mission is showing scientists how to understand this emission and, in the future, search for alien worlds by listening for their sounds. Click here for the full story:
Space News 
The first thing an alien race is likely to hear from Earth is chirps and whistles, a bit like R2-D2, the robot from Star Wars. In reality, they are the sounds that accompany the aurora. Now ESA?s Cluster mission is showing scientists how to understand this emission and, in the future, search for alien worlds by listening for their sounds. 