Stratospheric balloons are large, helium-filled balloons that can reach altitudes of 10 to 40 kilometers (6 to 25 miles) in the Earth's atmosphere. They are used for various scientific purposes, including weather monitoring, atmospheric research, and testing new technologies. These balloons can carry instruments and payloads to collect data about temperature, pressure, and other atmospheric conditions. These balloons operate in the stratosphere, a layer of the atmosphere located above the troposphere. Stratospheric balloons are often used by organizations like NASA and universities to conduct experiments that are difficult to perform at lower altitudes. Their ability to float at high altitudes allows for extended observation periods and unique data collection opportunities.