208 GETTING ACQUAINTED WITH THE STARS 



1. There are many more stars than we can see. 



2. The stars are so far away it takes light from them many 

 years to reach us. 



3. The rotation of the earth on its axis causes an apparent daily 

 rotation of the stars. 



4. Stars vary greatly in size, brightness, and distance. 



5. All the stars we ever see with the unaided eye make up a 

 small part of a huge group called a galaxy. 



Before making your review summary, test your knowledge of 

 the facts of the unit by checking over the text so as to be sure you 

 know the facts underlying the generalizations. Then, using the 

 generalizations, the material in the text, and everything you have 

 read, seen, or done yourself, make a summary outline for your 

 notebook. This outline you may use when you make a recitation. 



TEST ON FUNDAMENTAL CONCEPTS 



Make two vertical columns in your workbook. Head one CORRECT 

 and the other INCORRECT. Under the first place the numbers of all state- 

 ments you believe to be correct. Under the second place all the numbers 

 of the statements you believe to be incorrect. Your grade = right answer 

 X2i 



I. The process which discloses the largest number of stars is : 



(1) counting them on a very clear night ; (2) looking through a 

 powerful telescope ; (3) by photography ; (4) by using an enlarging 

 camera. 



II. By the magnitude of a star is meant : (5) its distance away ; 

 (6) its size ; (7) its apparent brightness ; (8) its real brightness 

 compared to the sun. 



III. When a star gives a white or bluish white color, it is evidence 

 that the star is : (9) very hot ; (10) very near ; (11) a young star ; 

 (12) hot, but not so hot as our sun. 



IV. The stars in the sky: (13) keep their positions almost 

 unchanged year after year; (14) really move across the sky daily ; 

 (15) would not appear to move if the earth were still; (16) con- 

 stantly change their relative positions as do the drops of water 

 in the ocean. 



V. The Big Dipper: (17) is a galaxy; (18) contains "the 

 pointers" for locating Polaris; (19) revolves around the sun; 

 (20) appears to revolve around the North Star every 24 hours. 



VI. There are stars so far away that: (21) their discovery 

 awaits the building of more powerful telescopes ; (22) the light 

 leaving them today will not reach the earth for a hundred thousand 



