Good work on your article, altough according to newer findings, the reason for the cold temperatures on Mars are mainly caused by the lack of a magnetic field and therefore a sustainable atmosphere causing a greenhouse effect and a temperature increase.
Also the planets are not floating away from the sun in such an extreme way. There is an effect which is making us move very slowly away from the Sun. That is the tidal interaction between the Sun and the Earth. This slows down the rotation of the sun, and pushes the Earth farther away from the Sun. The yearly increase in the distance between the Earth and the Sun from this effect is only about one micrometer. So this is a very tiny effect.
You could argue that there is another effect which is also small, but somewhat bigger than the tidal effect. The sun is powered by nuclear fusion, which means the Sun is continuously transforming a small part of its mass into energy. As the mass of the Sun goes down, our orbit gets proportionally bigger. However, over the entire main sequence lifetime of the Sun (about 10 billion years), the Sun will only lose about 0.1% of its mass, which means that the Earth should move out by just ~150,000 km.

Please feel free to correct me if I am wrong and keep up your work!

References: Physics for Chemists I lecture, University of Innsbruck