Among this group, most of those with traces of heavy elements also have traces of hydrogen.

这类白矮星中有着重元素痕迹者，大多也会有氢的痕迹。

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Forged by the Milky Way's abundant stars, such heavy elements are the building blocks of terrestrial planets.

这些由银河系众多恒星锻造出的重元素正是类地行星的构建模块。

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These youngsters had low supplies of heavy elements-for example, their oxygen content was only 20 percent of the sun's.

这些年轻的恒星提供的重元素很少——例如，它们的含氧量仅为太阳的20%。

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In the last two centuries, both these most characteristic elements of Western civilization have in fact become increasingly under heavy attack.

近两个世纪以来,西方文明这些,最具代表性的因素实际上,正遭到越来越多的抨击

耶鲁公开课 - 古希腊历史简介课程节选

For really heavy elements, such as uranium, such fission happens spontaneously.

ECONOMIST: Sir Fred Hoyle

Instead, these giants may simply have dumped all their contents back into space, dispersing heavy elements like iron equivalent to the mass of 10 of our Suns.

BBC: Astronomers detect 'monster star'

The problem of the heavy elements is actually two problems.

ECONOMIST: Sir Fred Hoyle