Speed of light they appeared 13 billion years ago, when the universe was less than a billion years old. The fact that more distant objects appear to be younger, due to the finite speed of light, allows astronomers to infer the evolution of stars, of galaxies, and of the universe itself. Astronomical distances are sometimes expressed in light-years, especially in popular science publications and media. A light-year is the distance light travels in one year, around 9461 billion kilometres, 5879 billion miles, or 0.3066 parsecs. In round figures, a light year is nearly 10 trillion kilometres or nearly 6 trillion miles. Proxima Centauri,
Kwangmyŏngsŏng-3 Unit 2 However, the launch of Kwangmyongsong 3 Unit 2 made North Korea the tenth country to place a satellite into orbit using an indigenously developed carrier rocket. The rocket was largely made using domestically produced parts and technology; this ability is seen as cause for greater concern over North Korea's ability to develop ballistic missile technology despite sanctions. The launch was announced on 1 December 2012, when the Korean Central News Agency reported that the Korean Committee of Space Technology informed them that they "[plan] to launch another working satellite, second version of Kwangmyŏngsŏng-3, manufactured by its own efforts and with