The solar system is alive. At its heart is our Sun, offering the very molecules of its body to create the energy fuelling the system. The planets are the concentrated remnants of an enormous cloud of dust and gas that had transformed into a disk, condensed at its center until finally igniting into a star. The new sun burned away its mantle of gas, just as we can see it happen today in nearby supernovae. In the early days of sun's life, far more comets rained into the inner solar system, carrying some organic matter and water. Earth may be the only life-sustaining planet in the solar system, but there is a possibility that some moons of Jupiter and Saturn may be life-friendly as well.