7-40 Muhammad ibn al-Hassan - may God be pleased with him - narrated that Muhammad ibn Yahya al-Attar quoted Muhammad ibn Ahmad, on the authority of Isa ibn Muhammad, on the authority of Ali ibn Mahzyar, on the authority of Ali ibn Hisan, on the authority of Abi Ayoob, on the authority of Muhammad ibn Muslim, “I asked Abi Ja’far al-Baqir (MGB), ‘May I be your ransom! Why is the Sun hotter than the moon?’ Then he (MGB) replied, ‘Indeed the Blessed the Sublime God created the Sun from layers of the light of fire and pure gaseous water one layer of each upon the other until the seventh layer which can be seen and is made of fire. Thus, the heat of the Sun is more than that of the moon.’ I asked, ‘How about the moon?’ The Imam (MGB) replied, ‘The Sublime God has made the moon from layers of the light of fire and gaseous vapors one upon another for seven layers and has covered up the seventh layer with water. That is why the moon is cooler than the Sun.’