For a number of other galaxies, astronomers can circumvent the dark-matter problem by observing how a galaxy bends the light of more distant galaxies.

对于一些别的星系，天文学家可以通过观测星系怎样扭曲更远的星系发出的光来规避暗物质的问题。

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During the three month competition, there were 73 teams that submitted solutions to the dark matter problem.

FORBES: Mapping The Universe Through Collective Brainpower

And it is by measuring the ratio of the latter to the former, and the behaviour of any excess across the energy spectrum, which may provide a way into the dark matter problem.

BBC: Alpha Magnetic Spectrometer to release first results

The problem is that dark matter is invisible.

ECONOMIST: Spotting dark matter, at last