Question

Why doesn't mercury have an atmosphere?

Answer 1

The main reasons are two. Mercury's atmosphere is hard to hold onto because it is small and does not have much gravity. As Mercury is close to the Sun, any atmosphere is blasted away by material being blown off the Sun.

Hope this helps friend!

Answer 2

First mercury is small and does not have much gravity so it is hard to hold on to atmosphere . Second mercury is close to the sun .