Rocky planets, also known as terrestrial planets, are a type of planet that is primarily composed of silicate rocks or metals. These planets have solid surfaces, as opposed to gas giants like Jupiter and Saturn. The four rocky planets in our solar system are Mercury, Venus, Earth, and Mars. Research in the area of rocky planets includes studying their geology, atmosphere, and potential for supporting life. Scientists are particularly interested in understanding the processes that shaped these planets, such as volcanism, tectonics, and impact cratering. They also study the composition of their atmospheres and surfaces to learn more about their history and potential habitability. Recent advancements in technology have allowed astronomers to discover rocky exoplanets orbiting other stars, further expanding our understanding of these planets and their diversity. Research in this area aims to shed light on the formation and evolution of rocky planets, as well as the potential for finding Earth-like worlds in other solar systems.