![]() ![]() Gas planets: These are exoplanets that are made mostly of gas and do not have a solid surface.Rocky planets: These are exoplanets that are made mostly of rock and have a solid surface.The three main composition categories for exoplanets are: Another common way to classify exoplanets is by their composition. Large planets: These are exoplanets that are more than four times the size of Earth.Medium-sized planets: These are exoplanets that are between two and four times the size of Earth.Small planets: These are exoplanets that are less than twice the size of Earth.The three main size categories for exoplanets are: There are many different ways to classify exoplanets, but one of the most common is by their size. The first exoplanet was discovered in 1992, and since then, astronomers have found thousands more. ![]() An exoplanet is a planet that orbits a star outside our Solar System. ![]()
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