The sudden contraction of a star due to its own gravity. A star tries to contract due to gravity, but the interior is hot and pressured due to nuclear fusion reactions, and this pressure prevents the contraction, maintaining a state of equilibrium. However, when the nuclear fusion reactions inside the star progress and all the fuel is consumed, the balance is broken and the star begins to contract. The contraction causes the internal temperature to rise, and when it exceeds 4 billion K, it undergoes rapid gravitational collapse, ultimately leaving behind a neutron star at the center. It is thought that gravitational collapse does not stop in stars with a core mass more than twice that of the sun, and ultimately a black hole is formed. Source : Heibonsha Encyclopedia About MyPedia Information |
恒星が自身の重力のために急激に収縮すること。恒星は重力のために収縮しようとするが,内部は核融合反応によって高温,高圧になっているため,その圧力で収縮をおしとどめつり合いの状態を保っている。しかし,星の内部での核融合反応が進んで燃料を消費しつくしてしまうとつり合いの状態は破れ,収縮を始める。収縮によって内部の温度は上がり,40億Kを超えると急激に重力崩壊を生じて,最後には中心部に中性子星が残る。中心核の質量が太陽の質量の約2倍以上ある星では重力崩壊は止まらず,最後にブラックホールが生じると考えられている。
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