Масса и размер Луны и Тритона (спутника Нептуна) приблизительно одинаковы. Почему на Луне не может быть атмосферы, а у Тритона она есть?

1. I went to the shops to buy some shoes.
2. Do you enjoy dancing?
3. When I was young, I used to go ice-skating.
4. He told me he loves me. I didn't know what to say.
5. When we were on holiday, we went swimming every day.