Joule, a unit of energy or work in the metric system of measurement. By definition, one joule is the work done when a force of one newton is exerted over a distance of one meter. (A newton is the force necessary to give a mass of one kilogram an acceleration of one meter per second per second.) The joule is an absolute unit—that is, it is based on mass rather than weight and hence is independent of the force of gravity. Another, less commonly used metric unit of energy or work is the erg. One joule equals 10,000,000 ergs. In the traditional English system of measurement, the foot-poundal is used in place of the joule. A foot-poundal is equal to approximately 1/25 of a joule.
On February 17, NASA launched a rocket with a record-setting five satellites onboard. The $200 million mission is to discover the source of an atmospheric phenomenon known as the geomagnetic substorm.
Our planet would be a much different place without its richly diverse ecosystems full of plants, animals and microorganisms. What poses the biggest danger to the millions of species that call Earth home?