The selective accretion theory chalks it up to high gas density in the early solar system, during the planet's formation.

选择性附加理论写出它的高气体密度在早期太阳系，在行星的形成。

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In one - the 'accretion' model - small clumps of dust build up over millions of years to form a planet's solid core, which then pulls gases towards it.

一个被称作‘连生’模型，指尘埃碎块经过数百万年的时间聚集形成了一颗行星的固体核心，之后它将周围的气体俘获据为己有。

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Active galaxies give off bright radiation from their cores, where gas heats up as it is compressed into a swirling accretion disk encircling the black hole.

活动星系从它们的核部发出明亮的光芒，在那里，气体被加热并压缩成一个漩涡状的圆盘，漩涡的中心便是黑洞。

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And even some journalists wonder if a new statute on privacy might be simpler than the accretion of judge-made law that has grown up in recent years.

ECONOMIST: The courts will decide the price of ending the affair

As matter goes in and gathers into what is called an accretion disk, it heats up and emits X-rays.

BBC: First glimpse of a black hole's spin