All black holes are formed from the gravitational collapse of a star , usually having a great , massive , core 所有的黑洞都是因为恒星的引力坍缩而形成,这种恒星通常有一颗巨大而厚重的核心。
Instead , they would collapse to form galaxies and stars , starting from about two billion years after the big bang 然后反过来,坍缩而形成诸星系及恒星,这种情况开始于大爆炸之后约20亿年。
If the universe is closed , omega is greater than unity , and the universe will eventually stop its expansion and recollapse back upon itself 如果宇宙是封闭的,欧米加大于平均数,而且宇宙最终会停止它的膨胀及重新往回坍缩自己。
After the process of matter ejection stellar body will continue collapsing into black hole if the mass of the nuclear - energy - exhausted star is more than 3 mq 星体经过物质抛射后,核能耗尽的恒星质量超过3m _ ,则此星体将继续坍缩成黑洞。
If these constants had significantly different values , either the nucleus of the carbon atom would not be stable , or the electrons would collapse in on the nucleus 假如这些常量的值和现有值很不相同,那么要么是碳原子核会不稳定,要么就是电子会坍缩,跌落到原子核上去。
Colliding black holes , collapsing stars , and spinning compact celestial objects such as pulsars create ripples in the fabric of space and time that subtly distort the world around us 黑洞碰撞、恒星坍缩以及自旋脉冲星所激起的时空结构波动,微妙的扭曲了我们周围的世界。
Most astrophysicists accept that this is the case , since according to general relativity , any concentration of matter of sufficient density must necessarily collapse into a black hole 大多数天体物理学家接受这个情形,自从依照广义相对论,充份密度物质任何集中一定必然坍缩为一个黑洞。
The evolution of fixed star having something to do with nuclear reaction , the star generally loses partial mass in its final period and finally collapses into compact star ( white dwarf , neutron star or black hole ) 恒星的演化与核反应有关,演化到晚期的恒星一般要损失一部分质量,然后坍缩成致密星(白矮星、中子星或黑洞) 。