We are 
This week we’re not going to give you any hints, so we’ll let you think in silence.
But we still expect to read your replies with explanations! #ArianeGrouppic.twitter.com/6XV45pPyJD
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Since dB is a logarithmic scale 0dB doesn’t mean no sound That would correspond to -infinity dB. Due to a very low but non-zero particle/energy density in space, I would have thought the answer to be some large large negative dB amount. But it seems not to be
You're absolutely right Jan, but we had to convey the general idea to our non-engineers followers. 
