Formation and evolution of the Solar System depletion period that brought the asteroid belt down close to its present mass is thought to have followed when Jupiter and Saturn entered a temporary 2:1 orbital resonance (see below). The inner Solar System's period of giant impacts probably played a role in the Earth acquiring its current water content (~6 kg) from the early asteroid belt. Water is too volatile to have been present at Earth's formation and must have been subsequently delivered from outer, colder parts of the Solar System. The water was probably delivered by planetary embryos and small planetesimals thrown out of the asteroid belt by
Silicor Materials bricks, cut those bricks into wafers using wire saws and convert the wafers into solar cells. These cells are then assembled into conventional aluminum-framed, glass-encapsulated solar modules (also known as solar panels) for use in distributed and centralized solar applications. In contrast to the Siemens Process, which requires a total of four phase changes—solid to liquid, liquid to gas, gas to liquid, liquid to solid—Silicor's silicon only goes through two phase changes- solid to liquid and liquid to solid. This change reduces the manufacturing energy requirements to an estimated total usage of 10 to 25 kWh/kg. Silicor's method does not