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Astronomy - Wikipedia, the free encyclopedia
Astronomy is a natural science that deals with the study of celestial objects (such as stars , planets , comets , nebulae , star clusters and galaxies ) and phenomena that originate outside the atmosphere of Earth (such as cosmic background radiation ). It is concerned with the evolution, physics, chemistry, meteorology, and motion of celestial objects, as well as the formation and development of the universe . Astronomy is one of the oldest sciences.Space physics , also known as space plasma physics , is the study of plasmas as they occur naturally in the universe . As such, it encompasses a far-ranging number of topics, including the sun , solar wind , planetary magnetospheres and ionospheres , auroras , cosmic rays , and synchrotron radiation .
Space physics - Wikipedia, the free encyclopedia
Plasma (physics) - Wikipedia, the free encyclopedia
Planetary science (rarely planetology ) is the scientific study of planets (including Earth ), moons , and planetary systems , in particular those of the Solar System and the processes that form them.

