The law of Entropy or law of energy decay, as it is sometimes known, states that every system, left to its own, tends to move from order to disorder. In other words, the universe is proceeding in a downward degenerating direction of decreasing organization. Material possessions deteriorate and all living organisms eventually return to dust, a state of complete disorder. The molecules of this podium, left on its own, will eventually loose their bond on each other and the podium will decay. In the same way our bodies turn back to dust.
Castles turn into rubble.
This law affects the whole universe. The sun is burning up. Stars are aging. Orbits are decaying. Things begin to deteriorate.