A nuclear blast is an explosion with intense light and heat, a damaging pressure wave, and widespread radioactive material that can contaminate the air, water, and ground surfaces for miles around.

核爆炸会释放出高能量的光和热，破坏力巨大的压力波，而且四处飘散的放射性物质会污染数周围英里内的空气，水，和地表。

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If the explosion is some distance away, it could take 3 0 seconds or more for the blast wave to hit.

如果爆炸距离较远，爆炸产生的冲击波会在30秒左右到达。

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As the supernova blast wave slams into tenuous clouds of interstellar gas, the resulting collision heats and compresses the gas, causing it to glow.

当高速行进的超新星冲击波与稀薄的星际气体相撞时，气体受到压缩和加热，因此而发光。

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The engineers also investigated dividing carriages with materials that soak up energy and reduce the impact of a blast wave.

BBC: Newcastle engineers research bomb-proof train carriages

The blast wave circled the planet three times.

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The dangerous pressure wave that causes primary blast injuries drops off quickly with distance, but shrapnel can cause injury far from the attack.

FORBES: Blast Victims: What We Know About The Kinds Of Injuries That Occurred In Boston