There is yet no universally accepted classification system for exoplanets. New advanced observation methods made it possible, in some cases, to observe the atmosphere of an exoplanet and identify the chemical composition. The distance and type of star in the alien star system can provide clues about the temperatures found on the planetary surface. Knowing the mass it is possible to calculate the gravitational force on the planet's surface and determine if it can hold an atmosphere. The shape of the orbit can be used to calculate the mass of an exoplanet. However, we can only speculate about the environment found on an exoplanet. In reality, the first exoplanet was discovered in January 1992 and today more than 3,700 planets in other star systems are known. Aboard the Enterprise, Spock can easily scan and classify a planet. For example, planets suitable for humans, small, rocky worlds with some geological activity and oxygen-atmosphere, are classified as M after Minshara, the native name of Vulcan, homeworld of Commander Spock.
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