The exosphere is the outermost layer of Earth's atmosphere, extending from about 600 kilometers (373 miles) above the surface to around 10,000 kilometers (6,200 miles). In this region, the atmosphere is extremely thin, and particles are so sparse that they can travel hundreds of kilometers without colliding with one another. The exosphere primarily consists of hydrogen and helium, along with trace amounts of other gases. This layer plays a crucial role in space weather and satellite operations. Satellites in low Earth orbit, such as those used for communication and weather monitoring, can experience drag from the thin atmosphere in the exosphere. Understanding the exosphere is essential for the study of space exploration and the behavior of satellites.