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On one day,billions of people sees lights from real nuclear explosion, but they don't escape and even have no fear for that, just continue their life as usual, why?

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Because:

The sun is a constant nuclear reaction

Though:

I don't know whether it qualifies as an explosion, per se.

If not:

Maybe you could be thinking of a solar flare?

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  • $\begingroup$ I've read somewhere that the amount of heat generated inside the sun per cubic meter of volume is roughly the same as the amount generated by a compost heap. It's just very, very big. $\endgroup$ – Jaap Scherphuis Aug 18 '17 at 4:40
  • $\begingroup$ @JaapScherphuis Depending on how you calculate it, it can either be better or worse. $\endgroup$ – boboquack Aug 18 '17 at 7:33
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Or perhaps (similar to the answer @boboquack gave):

They are looking at the light from a supernova?

Though:

I don't know that a billion people would be looking at it - nominally they could, since it'd likely look like a star in the sky, but how many people can/do look at stars...?

They would not be scared:

Because the supernova itself happened a long time ago - the light took until now to reach Earth, but the event itself is long past.

Of course, there are a bunch of other explanations:

Because they didn't notice that the supernova was different from any other star... because they knew the supernova was far, far away from Earth... etc.

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Well, perhaps they

are watching recorded videos of the atomic bombs dropped on Hiroshima and Nagasaki of Aug.6th / 8th 1945...in their television sets :-)

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  • $\begingroup$ I doubt that 'billions of people' watch this every day. A couple of thousand at most probably. $\endgroup$ – Beastly Gerbil Aug 18 '17 at 12:15
  • $\begingroup$ It is mentioned on one day. Not every day. $\endgroup$ – Mea Culpa Nay Aug 18 '17 at 12:17
  • $\begingroup$ It still says 'billions'. $\endgroup$ – Beastly Gerbil Aug 18 '17 at 12:22

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