ASTRONOMY Trying to figure out what a year the explosion of a star actually took

Question

ASTRONOMY

Trying to figure out what a year the explosion of a star actually took place.

http://news.nationalgeographic.com/2017/01/see-star-explode-2022-nova-cygnus-skywatching-space-science/

the article is talking about a star that will be visible to us in 2022. And we know that it is 1843 light years away (data given by professor) . I need to find what year the explosion took place.

So it is known:

that it will be visible in 2022, it is 1843 light years away, 1 light year is 365.25 days.

unknown is year of explosion?

Explanation / Answer

Light year means the distance of light travels in one year.

It is 1843 light years away. i.e. Light travelled 1843 years so that it can be visible to us.

So the explosion happened in 2022 - 1843 = 179.

Explosion happened in the year 179.

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