Sentence:  The radio emission of a <WSD>planet</WSD> was first detected in 1955 , when Burke and Franklin ( 1955 ) identified the origin of interference like radio noise on their records at about 15 meters wave length as emission from Jupiter . 
Meaning of the word marked with <WSD> tags:  (astronomy) any of the nine large celestial bodies in the solar system that revolve around the sun and shine by reflected light; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto in order of their proximity to the sun; viewed from the constellation Hercules, all the planets rotate around the sun in a counterclockwise direction