The Life Cycle of Stars The life cycle of stars go in predictable stages The exact route a star's development takes depends on its initial mass Initial Stages for All Masses The first four stages i...
近些年，越来越多的家长意识到国际教育的重要性，A-level课程也成为众多家长和学生的首选。今天就为大家盘点一下，Alevel课程A*高分及最难的科目，为进入世界顶级学府做准备。 Alevel的A*标准 Alevel的每一科考试...
The Hertzsprung - Russell Diagram Danish astronomer Ejnar Hertzsprung, and American astronomer Henry Noris Russell, independently plotted the luminosity of different stars against their temperature...
Determining distance using standard candles Standard Candles A standard candle is defined as: An astronomical object which has a known luminosity due to a characteristic quality possessed by that c...
Determining Distance using Parallax The principle of parallax is based on how the position of an object appears to change as the position of the observer changes For example, when observing the sca...
Inverse Square Law of Flux The moment the light leaves the surface of the star, it begins to spread out uniformly through a spherical shell Light sources which are further away appear fainter becau...
Wien's Law Wien’s displacement law relates the observed wavelength of light from an object to its surface temperature, it states: The black body radiation curve for different temperatures peaks at ...
Stefan-Boltzmann Law An objects luminosity depends on two factors: Its surface temperature Its surface area The relationship between these is known as the Stefan-Boltzmann Law, which states:...
Black Body Radiation Black body radiation is the name given to the thermal radiation emitted by all bodies (objects) All objects, no matter what temperature, emit black body radiation in the form o...
