HYDROGEN FUSION: The process by which hydrogen nuclei combine to form helium, releasing energy.
Month: July 2025
MAIN SEQUENCE: The phase in a star’s life when it is fusing hydrogen into helium in its core.
MAIN SEQUENCE STARS
MASS-LUMINOSITY RELATIONSHIP: The relationship between a star’s mass and its luminosity, which helps determine its position on the Hertzsprung-Russell diagram.
HELIUM FLASH: A sudden onset of fusion in the core of a red giant star, which causes a rapid increase in luminosity.
RED SUPERGIANTS: Very large stars that are near the end of their life, before becoming supernovae.
STELLAR EVOLUTION: The process by which a star changes over time, represented on the Hertzsprung-Russell diagram.
COOL STARS: Stars that appear red, located at the bottom right of the diagram.
HOT STARS: Stars that appear blue or white, located at the top left of the Hertzsprung-Russell diagram.
COLOR INDEX: A number that indicates the color of a star, derived from its measurements in different wavelengths.