Articles to help you discover the wonders of the Universe

Solar Physics

Solar physics is the branch of astrophysics that specialises in the study of the Sun and stars. These articles cover types of stars, the life cycle of stars, spectroscopy and observations of our Sun.


The Chandrasekhar limit is an upper bound on the mass of bodies made from electron-degenerate matter, a dense form of matter which consists of nuclei immersed in a gas of electrons.
Chandrasekhar Limit


Electron degeneracy pressure is a consequence of the Pauli exclusion principle, which states that two fermions cannot occupy the same quantum state at the same time. The force provided by this pressure sets a limit on the extent to which matter can be squeezed together without it collapsing into a neutron star or black hole.
Electron Degeneracy Pressure


The Hertzsprung-Russell diagram shows the relationship between different properties of stars and illustrates trends among stars. The diagram was created in 1910 by Ejnar Hertzsprung and Henry Norris Russell, and represented a huge leap forward in understanding stellar evolution, or the 'lives of stars'.
Hertzsprung-Russell Diagram and the Main Sequence


We are all pretty familiar with stars. We see them on clear nights as tiny, twinkling pinpricks of light in the sky. They have intrigued mankind since the beginning of time, but what is a star?
What is a Star? How do Stars Live and Die?


In astronomy, spectral classification is a classification of stars based initially on photospheric temperature and its associated spectral characteristics and subsequently refined in terms of other characteristics.
Spectral Classification of Stars


In astronomy, luminosity is the total amount of energy radiated by a star, galaxy, or another astronomical object per unit time. It is related to the brightness, which is the luminosity of an object in a given spectral region. In SI units luminosity is measured in joules per second or watts.
Luminosity and Flux of Stars


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