Hafife BOZDEMİR; Ebru EZBERCİ ÇEVİK; Sevcan CANDAN HELVACI; Mehmet Altan KURNAZ. THE EFFECT OF TELESCOPE OBSERVATIONS BASED ON TGA (PREDICT-OBSERVE-EXPLAIN) METHOD ON PRESERVICE SCIENCE TEACHERS UNDERSTANDING OF SOME ASTRONOMY CONCEPTS. IJOESS 2017, 8, CLXXXVIII-CCVI.