I read a paper earlier this year that suggested the “density of something” changes with distance from the Sun. I took the data points the person used (from the Pioneer 10/11 data) and they fit an inverse square curve perfectly. I put the data points into a spreadsheet and extrapolated them inward and outward. You don’t get much change in the “density of something” with the relatively small distance changes with our elliptic orbit. The changes noted in the report are at the maximum and minimum distances the earth is from the Sun.