Planets are believed to emerge from the accretion of particles in a disk of gas and dust as they whirl around the star.

行星被认为是由围绕恒星旋转的气体和尘埃组成的圆盘中的粒子累积而成。

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The disk exerts its own gravitational tug, and this interplay of forces robs the planet of momentum in its orbital path, forcing it to spiral in toward the star.

圆盘产生自己的引力拖曳，这种相互作用的力夺走了行 星在其轨道上的动量，迫使它盘旋向恒星的方向。

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Planets form from a disk of gas and dust swirling around a young star.

行星是由围绕着年轻恒星旋转的气体和灰尘的盘状物所组成。

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Astronomers were interested in the star because the disk of materials around it showed certain asymmetries.

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But despite the violent behavior witnessed from V1647 and the surrounding disk, the star appears to have been relatively stable since the researchers began studying it in 2004.

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"Conditions within the disk will vary from star to star, and chance, as much as anything else, determined the precise end results for our Earth, " Livio said.

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