Planetary atmospheres refer to the layers of gases surrounding planets in our solar system and beyond. These atmospheres play a crucial role in shaping the climate, weather, and overall environment of a planet. Scientists study planetary atmospheres to understand the composition, dynamics, and interactions of gases in these environments, as well as the impact of various factors such as solar radiation, greenhouse gases, and atmospheric pressure on a planet's atmosphere. Research in planetary atmospheres also involves studying the potential for habitability of exoplanets and understanding how atmospheres evolve over time. Overall, this research area provides valuable insights into the processes that govern the atmospheres of planets in our solar system and helps to inform our understanding of the universe as a whole.