Sometime billions of years in the future, he predicts, the core and mantle could cool and solidify enough to meet the crust. If that happens, Earth will become a cold, dead planet like the moon. Long before such an occurrence, however, the Sun will likely have evolved into a red-giant star, and grown large enough to engulf our fair planet.
The term increment is occasionally used in physics and engineering to represent a small change in a parameter such as temperature, electric current, visible light intensity, or time. Also see Mathematical Symbols.
An annuity is a long term investment that is issued by an insurance company designed to help protect you from the risk of outliving your income. Through annuitization, your purchase payments (what you contribute) are converted into periodic payments that can last for life.