^TagWhite dwarf star

Our Sun is a yellow dwarf star, shiny but comparatively short-lived. Red dwarfs are said to be the most common and longest-lived type of star in our galaxy. They are long-lived because they do not emit much radiance. How large are their habitable zones? A key problem turns on how much light they emit that is useful for life. That was quite a topic of discussion earlier this year at Centauri Dreams (dedicated to “Imagining and Planning Interstellar Exploration”). Astronomer and mathematician Henry Cordova offers some thoughts: All else being equal, the radiant flux received by the planet must then be directly proportional to the luminosity of the star, and inversely proportional to the square of the planet’s distance from Read More ›