The Kwangmyŏngsŏng-3 Unit 2 is North Korea's first orbital satellite. It was launched on December 12, 2012. It replaced the Unit 1 that failed to orbit on April 13, 2012. It weighs almost 220 pounds. It is used to collect Korea's weather data, estimate crop yields, and gather data about the country's forest coverage. Its planned lifespan is only two years.