( ( ( ( ( ( ( The ( Sun 's ) ) corona ) , ) or ) ( extended ( outer layer ) ) ) , ) ( ( is ( ( ( a region ) ( of plasma ) ) ( that ( is ( heated ( to ( ( ( ( over a ) million ) degrees ) Celsius ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (DT The) (NNP Sun) (POS 's)) (NN corona)) (, ,) (CC or) (NP (JJ extended) (JJ outer) (NN layer)) (, ,)) (VP (VBZ is) (NP (NP (DT a) (NN region)) (PP (IN of) (NP (NN plasma))) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN heated) (PP (TO to) (NP (QP (IN over) (DT a) (CD million) (CD degrees)) (NNS Celsius))))))))) (. .)))
The Sun's corona, or extended outer layer, is a region of plasma that is heated to over a million degrees Celsius.
(ROOT (S (NP (NP (DT The) (JJ outer) (NN layer)) (PP (IN of) (NP (DT the) (NN sun)))) (VP (VBZ is) (VP (VBN made) (PRT (RP up)) (PP (IN of) (NP (NN plasma))))) (. .)))