Stars
Completion requirements
Browse the glossary using this index
Special | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | ALL
H
HeliumThe element produced during hydrogen fusion in most stars. | |
Hertzsprung-Russell (H-R) DiagramA graph that compares the luminosity and surface temperature of stars. | |
Hydrogen FusionThe process in which hydrogen nuclei combine to form helium inside stars. | |
Hydrostatic EquilibriumThe balance between the inward pull of gravity and the outward pressure produced by fusion. | |