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http://en.wikipedia.org/wiki/Astronomy#Stellar_astronomy

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

http://en.wikipedia.org/wiki/Space_physics

Plasma (physics) - Wikipedia, the free encyclopedia

http://en.wikipedia.org/wiki/Plasma_(physics)

Plasma lamp , illustrating some of the more complex phenomena of a plasma, including filamentation .

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.

http://en.wikipedia.org/wiki/Planetary_science

Planetary science - Wikipedia, the free encyclopedia

http://en.wikipedia.org/wiki/High-energy_astronomy

High-energy astronomy - Wikipedia, the free encyclopedia

From Wikipedia, the free encyclopedia High energy astronomy is the study of astronomical objects that release EM radiation of highly energetic wavelengths . It includes X-ray astronomy , gamma-ray astronomy , and extreme UV astronomy , as well as studies of neutrinos and cosmic rays .

Gravitation - Wikipedia, the free encyclopedia

Gravitation , or gravity , is a natural phenomenon by which physical bodies attract with a force proportional to their mass [ citation needed ] . Gravitation is most familiar as the agent that gives weight to objects with mass and causes them to fall to the ground when dropped.

http://en.wikipedia.org/wiki/Gravitation

http://en.wikipedia.org/wiki/Physical_cosmology

Physical cosmology , as a branch of astronomy , is the study of the largest-scale structures and dynamics of the universe and is concerned with fundamental questions about its formation and evolution. [ 1 ] For most of human history, it was a branch of metaphysics and religion .