根据一种假设，这颗行星的重力场会对由尘埃和气体组成的原行星盘产生牵引力。
According to one hypothesis, the planet's gravitational field tugs on the protoplanetary disk of dust and gas from which it formed.
柯依伯带被认为是50亿年前形成太阳系的原行星盘的古老的残留物质。
The objects are considered fossil remnants of the swirling disk of debris that coalesced to form the solar system roughly 5 billion years ago.
沃森说：“在对原行星盘及其演化情况的理解上，该研究取得了较大的进展。”亚利桑那州图森史都华天文台。
The study represents "a major advance in our understanding of protoplanetary disks and their evolution, " Watson says. And astronomer Zoltan Balog of the Steward Observatory.
这是哈勃望远镜拍摄到的猎户星云中的原行星盘(proplyds，protoplanetarydisks)。
A Hubble Space Telescope image shows "proplyds, " or protoplanetary disks, in the Orion Nebula.
这是哈勃望远镜拍摄到的猎户星云中的原行星盘(proplyds，protoplanetarydisks)。
A Hubble Space Telescope image shows "proplyds, " or protoplanetary disks, in the Orion Nebula.
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