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Such stars eventually blow off the material of their outer layers, which creates an expanding shell of gas called a planetary nebula.

这样的恒星最终炸开了它们的外层物质，形成了向外扩展的气体盔甲，名为行星状星云。

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Infrared images from the Spitzer Space Telescope (yellow, red, and green) expose a surrounding shell of dust and gas that's being lit up as the material streams through a nearby star cluster.

由斯皮策太空望远镜拍摄到的红外照片(黄色、红色、绿色部分)正好是这颗气体恒星穿过附近的星团时，所显露出的尘埃及被点燃气团的外部结构。

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Greenhouse gas would be transported to the Shell-operated Goldeneye gas field in the North Sea using, as far as possible, existing pipeline infrastructure.

BBC: Shell and SSE want to develop carbon capture at Peterhead

Some of Shell's brightest longer-term gas prospects are in Saudi Arabia, where Shell has done business since the 1940s and helped build chemical plants.

FORBES: Companies, People, Ideas

The Iraqi cabinet approved a preliminary agreement that will create a joint venture between the state-run South Oil Company and Royal Dutch Shell to develop natural-gas resources in the Basra region.

ECONOMIST: Business this week