• Jul 11, 2025 A Hertzsprung Russell Diagram Is Used To Show The Relationship Between horizontal axis typically represents a stars surface temperature often expressed as spectral type eg O B A F G K M or its color The vertical axis displays the stars luminosity which is a measure of the total energy emitted per unit time Crucially the luminosity is not measured directly but By Darrin Reilly
• Apr 16, 2026 Hertzsprung Russell Diagram all, dense remnants of stars that have exhausted their nuclear fuel. Despite their relatively low luminosity, they have high surface temperatures due to their compact size. Stellar Evolution on the H-R Diagram: A Star& By Janice Mraz
