The Galactic core is obscured in visible light by dust clouds, which infrared light can penetrate.

“银河系核心在红外线可穿过的可见光中被尘埃云遮盖”是啥意思？

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It orbits some 25,000 light years from the galactic core, completing a revolution once every 250 million years or so.

太阳距离银河系中心25000光年，每2亿5000万年完成一周绕银心公转。

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However, some physicists believe that we don't know enough about the galactic core - or dark matter - to come to this conclusion.

然而，一些物理学家认为我们对银河核心，或者说，暗物质的认识并不全面，所以还不足以得出这个结论。

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However, X-rays emanating from the galactic core can penetrate the veil of gas and dust.

BBC: Black holes on collision course

The researchers suggest the clusters they originated from may no longer be active, thus shedding light on the history of star activity in the galactic core.

MSN: Giant gas geysers erupting from Milky Way galaxy