Astronomers this week announced their discovery of a moon orbiting an asteroid, in the first images ever obtained of such an object from Earth. Only one satellite orbiting an asteroid had been seen before from space.
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National Science Foundation. "Astronomers Sight An Asteroid's Moon." ScienceDaily. ScienceDaily, 7 October 1999. <www.sciencedaily.com/releases/1999/10/991007084000.htm>.
National Science Foundation. (1999, October 7). Astronomers Sight An Asteroid's Moon. ScienceDaily. Retrieved April 20, 2014 from www.sciencedaily.com/releases/1999/10/991007084000.htm
National Science Foundation. "Astronomers Sight An Asteroid's Moon." ScienceDaily. www.sciencedaily.com/releases/1999/10/991007084000.htm (accessed April 20, 2014).