Hafife BOZDEMİR, Ebru EZBERCİ ÇEVİK, Sevcan CANDAN HELVACI and Mehmet Altan KURNAZ 2017. THE EFFECT OF TELESCOPE OBSERVATIONS BASED ON TGA (PREDICT-OBSERVE-EXPLAIN) METHOD ON PRESERVICE SCIENCE TEACHERS UNDERSTANDING OF SOME ASTRONOMY CONCEPTS. International Journal of Eurasia Social Sciences . 8, 28 (Aug. 2017), CLXXXVIII-CCVI.