Discover published sets by community

The Luminosity Axis on the Hertzsprung-Russell Diagram measures the total energy output of a star. It is usually scaled in terms of the sun's luminosity (solar luminosities, L☉) and is crucial for understanding how bright a star truly is.

The Main Sequence is the major phase of stellar evolution characterized by the fusion of hydrogen atoms at the core. Stars in this phase are stable and it spans a wide range of stellar types, from small, cool red dwarfs to large, hot blue stars.

The Temperature Axis of the Hertzsprung-Russell Diagram runs horizontally and is inversely related to the color of the stars, with blue stars being the hottest and red stars being the coolest. It often uses Kelvin as a unit.

Spectral Classification is shown on the H-R diagram by dividing the temperature axis into spectral classes from hottest (O-type) to coolest (M-type). The spectral class of a star indicates its temperature, color, and absorption lines characteristic of the star's atmosphere.

White Dwarfs represent the final evolutionary stage of medium and low mass stars. They are found at the lower left part of the H-R diagram. These stars are very hot but less luminous due to their small size.