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。
2
This spinning motion, at speeds of hundreds of kilometers per second, may cause matter in the disk to take on a spiral shape.
这种以每秒数百公里的速度旋转的运动，可能会使圆盘上的物质呈现出螺旋形状。
3
As streams of material spiral from the disk onto the star, its mass increases and it brightens and heats up dramatically.