他们发现只有百分之十的恒星可以频繁地向外进行辐射，而这是表明它们周围存在原行星盘(proto-planetary disks)的有力证据。该研究还进一步显示只有8%的恒星有尘埃盘，且这些尘埃盘的质量仅仅略大于太阳质量的百分之一。
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The planetary bodies of our solar system all tend to lie near this plane, since they were formed from the sun's spinning, flattened, proto-planetary disk.
太阳系内所有的行星成员的运行轨道都趋于这个平面，因为它们都是依据以太阳为轴心的平面轨道运行的。
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Proposed sources of such high heating in the early solar nebula have included everything from colliding asteroids, gamma ray bursts, solar x-ray flares, even lightning in the proto-planetary disk itself.
FORBES: Planets Made Easy: The Cosmic Glue That Binds Us All
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