Sentence:  Steady radiation which was presumably of thermal origin was observed from Venus at 3.15 and 9.4 cm , and from <WSD>Mars</WSD> and Jupiter at 3.15 cm in 1956 ( Mayer , McCullough , and Sloanaker , 1958 a , b , c ) , and from Saturn at 3.75 cm in 1957 ( Drake and Ewen , 1958 ) . 
Meaning of the word marked with <WSD> tags:  a small reddish planet that is the 4th from the sun and is periodically visible to the naked eye; minerals rich in iron cover its surface and are responsible for its characteristic color