Labels:text | screenshot | candle OCR: RED GIANTS AN ELDERLY MAIN-SEQUENCE star of up to three solar masses evolves into Shell of hydrogen fusing Outer layers of to form helium hydrogen a red giant. This aging star has a contracting helium core surrounded by a hydrogen fusion shell. Radiation Core of helium from this shell causes the star's outer fusing to form carbon layers to expand and cool, and the star becomes a giant. Meanwhile, the core becomes hot enough for helium to fuse to form carbon. When all the helium has fused, the outer layers drift away to form a planetary nebula, while the core collapses to form a dying white dwarf. MIDDLE-AGE SPREAD The outer layers of a red giant are pushed outward by radiation from internal nuclear reactions. As they expand, the outer layers SELECTED COOL STARS GIANT cool and change color ...
