. Percentages of students and 
teachers regarding their some alternative concepts were as summarized in 
Table 3. Based on the data in Table 3, it could be said that students and even 
physics teachers had alternative conceptions about basic astronomy 
concepts. Also, the percentages of alternative conceptions that were 
measured with the two-tier items in all subjects were lower than the 
percentages of alternative conceptions that were measured only according 
to the first tier when Table 3 was examined. This condition was caused by 
lack of knowledge among students and physics teachers.