Active galaxies give off bright radiation from their cores, where gas heats up as it is compressed into a swirling accretion disk encircling the black hole.

活动星系从它们的核部发出明亮的光芒，在那里，气体被加热并压缩成一个漩涡状的圆盘，漩涡的中心便是黑洞。

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One of the most active star-forming regions near Earth, N11 is part of a complex network of gas clouds and star clusters in the Large Magellanic cloud, a neighboring galaxy.

其中一个最活跃的恒星形成区域靠近地球，N11是在大麦哲伦星云(一个邻近星系)里的气云和星团所组成的复杂网络的一部分。

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The interstellar cloud of gas and dust is an active star-forming region.

由气体和尘埃组成的星系云是一个恒星形成的活跃区域。

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The count is 36 percent below a year ago level and 74 percent below the all-time September 12, 2008 high of 1, 606 active gas rigs in service.

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Rather than relying on fire, electricity or natural gas, chefs at El Diablo heat their meat over a still-active volcano.

BBC: Dinner cooked by an active volcano

ExxonMobil, long active operating gas stations in Colombia, decided last month to resume exploration there after a ten-year hiatus, in partnership with the Brazilian and Colombian state-owned oil companies.

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