FIRST YEAR SCIENCE 



war. The other two bear the names Venus and Jupiter, 

 one named from the goddess of beauty and the other from 



^_ the king of the Roman 



gods. Astronomers call 

 the earth and these three 

 bodies, together with 

 four others, planets, and 

 tell us that they revolve 

 around the sun as a 

 center. They have no 

 light of their own as do 

 the true stars, but the 

 light which comes to us 

 from them is a reflection 

 of the light of the sun. 



The unaided eye is 

 able at some times to 

 see five of these planets. 

 Astronomers tell us that their change of place in rela- 

 tion to the stars is due to their motion about the sun. 

 If we could stand upon one of these visible planets, our 



MARS. 



Most like the earth of all the planets 

 is supposed to have a polar ice cap, 



It 



THREE VIEWS OF SATURN. 

 The planet with the beautiful rings. 



earth would appear to us like one of them. Bnt the 

 surface of some of these planets, like Jupiter or Saturn, 

 is not solid like that of the earth. Our sun, if seen 



