Take an object the exact mass and dimensions of Earth. Let's say this object currently exists 9,865,876,123,100,999,654,100,654,858^990,856,123,549,000,000,128,856,900,000 lightyears away. Does this object exert a measurable force of gravity on Earth? Yes it does. Now take that object, and let's say it's in our own solar system. The same object suddenly. exerts a much higher gravitational force on Earth. Now let's say it's 9,865,876,123,100,999,800,654,100,865,768,431,854,999,999,999,999,999,999,999,654,100,654,858^990,856,123,549,000,000,128,856,900,000,865,766,666,765,120,865,854,765 lightyears away. Less measurable gravity than the original scenario. Infinite universe, everything that exists exerts gravity on us, but the stuff that's really far away exerts a barely measureable force- yet it all adds up. Hence dark matter and dark energy. Capiche? Glad we're all on the same page.