На какой планете температура поверхности остается практически постоянной как в течение суток, так и на протяжении всего года?

I do on my lesson exercisses. On maths I want go to the blackboard, but my teacher dont ask me. On Russian I feel bored and this lesson dont interesed for me. on History I listen teacher and its very impotant lesson for me, because I want to be a historic!