While analyzing the data obtained from the ACT
 to determine the alternative conceptions,
the wrong answer that was the misconception was 
marked in the first tier was coded (0); if participants stated that they were 
sure about their answers and coded (1), the question was coded as 0-1, and 
was accepted as an alternative misconception. 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.