The central region of a star in which energy is generated by
→ thermonuclear reactions.
The central region of a planet or satellite which has a
→ differentiated interior.
The innermost and densest layer of the Earth, lying from 2890 km to 6360 km beneath
the surface. It consists primarily of the metals iron and nickel, and is divided into the
→ outer core, which is believed to be liquid, and the
→ inner core, which is believed to be solid.
The central region of a → star cluster.
A flat → density profile representing the
distribution of stars in the central region of a galaxy. Cores are found in
high mass galaxies. They are believed to result from the interaction of a central
→ supermassive black hole with another merging
black hole.
A progenitor of → protostars.
→ dense core.
→ reactor core.
Etymology (EN): Probably from O.Fr. cœur “core of fruit,”
literally “heart,” from L. cor “heart,”
cf. Gk. kardia: P.Gmc. *khertan- (O.E. heorte,
E. heart, Ger. Herz, Bret. kreiz “middle”),
Skt. hrd-; Av. zərəd-; Mid.Pers. dil; Mod.Pers.
del; Baluci zird; Arm. sirt; PIE base *kerd- “heart”.
Etymology (PE): Maqzé, from maqz “kernel; brain; marrow” + nuance suffix
-é. Mod.Pers. maqz from
Mid.Pers. mazg “brain; marrow,” Av. mazga- “marrow; brain” cf.
Skt. majján- “marrow,” P.Gmc. *mazga-,
O.E. mearg “marrow,”
Lith. smagenes “brain,” O.H.G. mark “marrow,”
PIE base *mozgho- “marrow, brain”.
