Space telescopes for the fundamental astrophysical problems solution

At the present time, space telescopes have become very important for astronomy and astrophysics due to their precise and continuous observation capability. Ground-based telescopes, on the other hand, an effect from atmospheric distortion and have limited observation time. Thanks to precise observation data of space telescopes, micro variations in the observed astrophysical sources can be detected by space telescopes and this provides us more detailed information about observed sources. Therefore, there are many space telescopes projects. In this thesis, firstly, some information about launched and projected space telescopes were given. Additionally, the data of the Kepler space telescope which is observing in the visual region and XMM-Newton space telescope which is observing in the x-ray region were studied. For this purpose, the data of KIC 9489411, KIC11616594, KIC3347485, KIC9392702 and KIC7938468 binary systems observed by Kepler were downloaded from the Kepler data archive. Light curve analyses of these systems were performed and the fundamental parameters were obtained. For the X-ray region, XMM-Newton data was used. Spectral analysis of IGR J17285-2922 and 1RXS J170854.4-321857 were performed. Thus, the X-ray region and the visual region of the electromagnetic spectrum were studied.