This question is based on “there’s plenty of room at the bottom” - richard feynman, 1959.
how large on a side would a cubic particle need to be to contain as many atoms as there are people on planet earth? express your answer in nanometers (nm), micrometers (um) and meters (m). make your own calculation, and state all your assumptions.

yup its correct its: c) b b

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.