The same minerals that occur in refractory inclusions are believed to be the earliest-formed substances to have condensed out of the solar nebula.

难熔的内含物中的那种矿物质，也被认为是最早形成的太阳星云凝结的物质。

youdao

The Sun still contains most of the matter from the initial solar nebula.

太阳依然含有原始太阳星云的大部分物质。

youdao

Our solar system arose from a large, rotating cloud of interstellar debris called the solar nebula.

太阳系形成于一个巨大的旋转星云——太阳系星云，星云中含有大量的星际残骸。

youdao

Asteroids are the rocky remains from the collapse of a solar nebula.

VOA: special.2011.06.22

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

Mr. EICHER: We can't really understand the solar system and how it got going unless we can really understand the origins and the conditions that happened when the solar nebula, this cloud of gas and dust, contracted down and the star turned on and the planets got going.

NPR: NASA 'Deep Impact' Probe Targets Comet

It describes a life form that inhabits a small nebula known as a Bok globule, which visits the solar system to refuel from the sun.

ECONOMIST: Sir Fred Hoyle