The following images show four identical sun-like stars and their companion planets, all traveling in circular orbits. in each case, the mass of the planet is given in jupiter masses and the orbital distance is given in astronomical units (au). rank each case based on the strength of the gravitational force exerted by the extrasolar planet on its central star, from weakest to strongest. if you think that two (or more) diagrams should be ranked as equal, drag one on top of the other(s) to show this equality. (not to scale)

An  atom  (ours, not carroll's) consists of a positively charged  nucleus, surrounded by one or more negatively charged particles called  electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6  nm.  *  if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -

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