Defines the system of coordinates used and the kinematics of objects in our galaxy. Astrometry – study of the position of objects in the sky and their changes of position.Theoretical astronomy – mathematical modelling of celestial entities and phenomena.Techniques used in astronomical research:.Forensic astronomy – the use of astronomy, the scientific study of celestial objects, to determine the appearance of the sky at specific times in the past.Space archaeology – the study of human artifacts in outer space.Archaeoastronomy – studies ancient or traditional astronomies in their cultural context, utilizing archaeological and anthropological evidence.Astrobotany – Sub-discipline of botany that is the study of plants in space environments.Space chemistry – Reactions of elements to form more complex compounds, such as amino acids, are key to the study of chemistry in space.Space biology – studies to build a better understanding of how spaceflight affects living systems in spacecraft, or in ground-based experiments that mimic aspects of spaceflight.Astrobiology – studies the advent and evolution of biological systems in the universe.Interdisciplinary studies of astronomy:.Astrochemistry – studies the abundance and reactions of molecules in the Universe, and their interaction with radiation.Exoplanetology – various planets outside of the Solar System.Atmospheric science – study of atmospheres and weather.Planetary Science – study of planets, moons, and planetary systems.Quantum cosmology – the study of cosmology through the use of quantum field theory to explain phenomena general relativity cannot due to limitations in its framework.Chemical cosmology - study of the chemical composition of matter in the universe and the processes that led to those compositions.The study of cosmology is theoretical astrophysics at its largest scale. Physical cosmology – origin and evolution of the universe as a whole.Extragalactic astronomy – study of objects (mainly galaxies) outside our galaxy, including Galaxy formation and evolution.Galactic astronomy – deals with the structure and components of our galaxy and of other galaxies.Stellar astronomy – concerned with Star formation, physical properties, main sequence life span, variability, stellar evolution and extinction.Solar physics – Sun and its interaction with the remainder of the Solar System and interstellar space.Space physics – study of plasmas as they occur naturally in the Earth's upper atmosphere (aeronomy) and within the Solar System.Plasma astrophysics – studies properties of plasma in outer space.Computational astrophysics – The study of astrophysics using computational methods and tools to develop computational models.The subdisciplines of theoretical astrophysics are: Among the objects studied are galaxies, stars, planets, exoplanets, the interstellar medium and the cosmic microwave background and the properties examined include luminosity, density, temperature, and chemical composition.
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