Can a supernova make a sound big enough to be heard even in space?

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Sound is only caused by pressure waves in a physical medium. These waves travel far slower than light. A powerful supernova sheds enoumous quantities of gas, and this acts like a giant piston that slams into the interstellar medium surrounding the expanding debris. The sound speed in the interstellar medium is about 2 kilometers/sec for very cold gas, and up to 10,000 kilometers/sec in the high temperature interstellar medium. The wavelength of the 'sound' pulse could be measured in fractions of a light year, but turbulence at the shock front could make for waves with lengths only a few thousand times the earth-sun distance...we really don't know. But yes, supernova produce sound waves, kind of like a stretched out crack of thunder ...but which would last thousands of years!