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Message: <blockquote data-quote="spiney" data-source="post: 273112" data-attributes="member: 192438">Yes, gravity is indeed the weakest of the "4 forces", but as PaulR says, the only one acting over (and beyond) galactic distances ......However, what's this about our being inside a "black hole"? Not true, as far as I know .....The earth's molten core is indeed highly active, but this is mostly manifested as continental drift (the continents slowly changing their relative positions, as a result of tectonic plates movement), with just the occasional big volcanic explosion .....</blockquote>