To explain this, they hypothesize that galaxies must contain a great deal of missing matter which cannot be detected.

为了解释这一点，他们假定银河系一定包含了大量无法探测到的不明物质。

《柯林斯英汉双解大词典》

This has led scientists to speculate on the existence of other galaxies.

这就使得科学家推测还有其他星系存在。

《牛津词典》

These galaxies may constitute an answer to the long-standing puzzle of the missing baryonic mass in the universe.

这些星系可能为宇宙中长期存在的缺少重子质量这一谜题提供了答案。

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By nineteen twenty-five, he had made enough observations to say that the universe is organized into galaxies of many shapes and sizes.

VOA: special.2009.04.29

All galaxies,he said, are related to each other, much as members of a family are related to each other.

VOA: special.2009.04.29

The idea is that the matter we see does not have enough gravitational pull to keep galaxies together.

VOA: special.2009.07.21

The Higgs boson is associated with the reason that everything in the universe -- from humans to planets to galaxies -- have mass.

CNN: Scientists more certain that particle is Higgs boson

To that end, the 570-megapixel camera will eventually measure up to 300 million galaxies up to 8 billion light years distant, as well as 100, 000 galaxy clusters, and 5, 000 supernovae.

FORBES: Dark Energy Camera Could Reshape Einstein Cosmology

These strings vibrate in such a way as to create galaxies and bluebirds, atoms and daffodils .

FORBES: Yes, Virginia . . .