² There is a “fire” that warms our skin by day. That “fire” is burning some 93 million miles (150 million km) away!a What power the sun must have for you to be able to feel its heat from such a distance! Yet, the earth orbits that awesome thermonuclear furnace at just the right distance. Too close, and earth’s water would vaporize; too far, and it would all freeze. Either extreme would render our planet lifeless.