Heliocentric and geocentric

me on this. i don't know what i'm supposed to do and im struggling

Explanation:

heliocentric means having the sun in the middle/center in the solar system

geocentric means having the earth in the middle/center in the solar system

therefore your answers are:

the planets orbit the sun.

in 1543, Nicolaus Copernicus proposed the theory.

the evidence that led people to believe this was when Galileo observed that four moons orbited around Jupiter. in other words, heliocentric.

most of the stars are located in the milky way galaxy.

lol idk man i guess u gotta ask bill nye the science guy

nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.