Why is it cold on Mars and hot on Mercury?

The reasons why it is cold on Mars and hot on Mercury are as follows:

1. The atmospheric density of Mars is very thin, which causes its temperature to be very low, very cold, and it is almost below zero every year. A lot of carbon dioxide can only be converted into rocks and thin oxygen.

2. Because Mercury is very close to the sun, the extreme high temperature weather on Mercury is the highest in the solar system.