NASA's robotic space probes have visited every planet in the solar system and several other celestial bodies. Telescopes have allowed scientists to look at the far reaches of space. Satellites have revealed a wealth of data about Earth, resulting in valuable information such as a better understanding of weather patterns. NASA has helped develop and test a variety of cutting-edge aircraft. These aircraft include planes that have set new records. Among other benefits, these tests have helped engineers improve air transportation. NASA technology has contributed to many items used in everyday life, from smoke detectors to medical tests.