These are some of the thoughts of the three astronauts who heard it:

The trio felt the sounds were so strange that they debated whether or not to tell the chiefs at NASA, for fear they wouldn’t be taken seriously and could be dropped from future space missions, according to the Discovery show.

Could it have been charged particles which is the most common theory?  Or is it likely something else.

The comments on the video thread are very spirited which is to be expected on a topic like this.

Feel free to comment with your ideas on this.

And here is a picture of the “arecibo message” which has been so debated

We hope you like the video and check back if any updates come in.

thanks to phys.org for the great info

thanks to eso.org for the pic