| http://www.w3.org/ns/prov#value | - We will know this if we discover that Pluto is mostly water ice, a big dirty snowball in a gravity dense space far from the sun, and that Mercury is a planet where most of the nonmetallic elements had been burned off, so that it is like a big metal ball around the gravity weak region of our star (which appears massive in gravity because of its great size).
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