Space research is scientific study carried out in outer space, and by studying outer space. From the utilization of space technology to the overt macrocosm, space research is a wide research field. Earth science, materials science, biology, medicine, and physics all apply to the space research environment. AstroSat is the first dedicated Indian astronomy mission aimed at studying celestial sources in X-ray, optical and UV spectral bands simultaneously. The payloads cover the energy bands of Ultraviolet (Near and For), constrained optical and X-ray regime (0.3 keV to 100keV). One of the unique features of AstroSat mission is that it enables the simultaneous multi-wavelength visual examinations of sundry astronomical objects with a single satellite. AstroSat with a hoist-off mass of 1515 kg was launched on September 28, 2015 into a 650 km orbit inclined at an angle of 6 deg to the equator by PSLV-C30 from Satish Dhawan Space Centre, Sriharikota. The minimum subsidiary life of the AstroSat mission is expected to be 5 years. Mars Orbiter Mission is ISRO first interplanetary mission to planet Mars with an orbiter craft designed to orbit Mars in an elliptical orbit of 372 km by 80,000 km. Mars Orbiter mission can be termed as a challenging technological mission and a science mission considering the critical mission operations and stringent requisites on propulsion, communications and other bus systems of the spacecraft. The primary driving technological objective of the mission is to design and realize a spacecraft with a capability to perform Earth Bound Manoeuvre (EBM), Martian Transfer Trajectory (MTT) and Mars Orbit Insertion (MOI) phases and the cognate deep space mission orchestrating and communication management at a distance of proximately 400 million Km. Autonomous fault detection and instauration withal becomes vital for the mission.Chandrayaan-1, India's first mission to Moon, was launched prosperously on October 22, 2008 from SDSC SHAR, Sriharikota. The spacecraft was orbiting around the Moon at a height of 100 km from the lunar surface for chemical, mineralogical and photo-geologic mapping of the Moon. The spacecraft carried 11 scientific instruments built in India, USA, UK, Germany, Sweden and Bulgaria. Chandrayaan-2 will be an advanced version of the anterior Chandrayaan-1 mission to Moon.Chandrayaan-2 is configured as a two module system comprising of an Orbiter Craft module (OC) and a Lander Craft module (LC) carrying the Rover developed by ISRO. The top online publishing journals publish articles which are cited as references by many authors in their work. Citations are consequential for a journal to get impact factor. Impact factor is a quantification reflecting the average number of citations to recent articles published in the journal. The impact of the journal is influenced by impact factor, the journals with high impact factor are considered more paramount than those with lower ones. Indexing provides facile access of the article online. The international journals are among the best open access journals in the world, set out to publish the most comprehensive, germane and reliable information predicated on the current research and development on a variety of subjects.