The factors that affects the gravitational force between two objects are

-- The product of their two masses (no matter what
the individual masses happen to be),

-- The distance between the centers of mass of the two masses.

Nothing else affects the force of gravity between two objects,
and nothing in between them can 'shield' or block it.

Neptune is the eighth planet from the sun. it was the first planet to get its existence predicted by  mathematical calculations  before it was actually seen through a telescope on sept. 23, 1846. irregularities in the orbit of  uranus  led french astronomer alexis bouvard to suggest that the gravitational pull from another celestial body might be responsible. german astronomer johann galle then relied on subsequent calculations to   spot neptune via telescope. previously, astronomer galileo galilei sketched the planet, but he mistook it for a star due to its slow motion. in accordance with all the other planets seen in the sky, this new world was given a name from greek and roman mythology — neptune, the roman god of the sea.

Protons have a positive charge and, collectively, give an element its atomic number.