[las3rjock]

That query calculates "median planet volume / volume of a small grain of sand", as mentioned by the grandparent poster. I believe it is still an open question how to get Wolfram|Alpha to calculate "total planet volume / volume of a small grain of sand".

[PhazeDK]

"solar system volume / volume of grain of sand" works. http://www54.wolframalpha.com/input/?i=solar+system+volume+/...

or "planets volume / volume of grain of sand"

[dangoldin]

Ah my mistake.

I tried "9 * average (planet volume) / average(volume of a grain of sand)" now but that's not working either.

[jodrellblank]

"total planetary volume / volume of a grain of sand" gives an answer in "mile cubed shares per picoliter".

Yowch.