I understand how science can be a very reliable tool for establishing how specific things happen and what they are like. I too give great credence to what is established in a scientific manner. Perhaps our Buddha used the language of Heavens and Hells because it was the most simple way to communicate to the people of his day. After all the Buddha is recorded as saying something like "I teach suffering and the way to the end of suffering". Not knowing whether or not particular things exist out their is not the kind of ignorance which we need to overcome to be free.
"Beautifully taught is the Lord's Dhamma, immediately apparent, timeless, of the nature of a personal invitation, progressive, to be attained by the wise, each for himself." Anguttara Nikaya V.332