Exoplanets
Exoplanets refer to planets that exist beyond the realm of our solar system. Thousands of these planets have been observed in the past few decades by astronomers, with each of them holding unique properties and characteristics. Although technological limitations hinder up-close observations of these planets (at this time), scientists are able to infer a number of basic assumptions about each of the Exoplanets discovered. This includes their overall size, relative composition, suitability for life, and similarities to Earth.