Its been scientifically proven that the sun will one day cease to burn and provide heat to the earth. Its also been scientifically proven that the moon is increasing distance from the earth, and that once it gets far enough away, the earth's orbit will change and wont be inhabitable by humans any more. It is scientifically proven, that no matter how long from now, humans will cease to exist. Where is heaven? Is it within the solar system? In the end, we go through trials daily in life.. and while it may seem important now, in the end its insignificant. Each person should live their lives how they see fit within what they believe. If the purpose of life is to be happy and reproduce, and the earth WILL be gone one day, if not by human destruction then nature, what is the purpose?