Messier 27 (M27) is an excellent example of a gaseous emission nebula created as a sun-like star runs out of nuclear fuel in its core.

Messier 27 (M27)是个气体发射星云的典型例子，它是由于类似太阳的恒星耗尽了其核心的核燃料而产生的。

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One answer:stretch the average life of nuclear plants, which are emission-free, from theagreed 32 years to a scientifically acceptable 40 (in America their life isalready being stretched to 60 years).

一个途径是：延长零排放的核电站的平均寿命，从已公认的32年延长至科学认证的40年（在美国，他们的寿命已经被延长至60年）。

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Now the most widely used nuclear medical instrument in clinic is Single Photon Emission Computed Tomography (SPECT).

目前临床上应用最广泛的核医学仪器是单光子发射型计算机断层，即SPECT。

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Ministers are trying to make planning rules more nuclear-friendly, and hope that tighter carbon-emission limits will help nuclear energy shine by comparison with fossil-fuel plants.

ECONOMIST: Nuclear power draws nearer as renewables retreat

They are more radioactive than is permissible for an emission from a nuclear plant.

FORBES: Does The DoD Want To Kill Us All With Radioactive Nuclear Scrap Metal? No, No Not Really

Of course, nuclear power is not the only carbon emission-free option.

ECONOMIST: Nuclear power