Question

Why is Mercury very hot during the day and very cold at night?

Answer 1

1. As mercury is close to Sun it gets very hot during the day with temperature reaching ${427}^{\circ }\mathrm{C}$.
2. At night Mercury loses all its heat as there is no atmosphere to retain the heat ,thus its very cold at night with temperature reaching $-{173}^{\circ }\mathrm{C}$.