I'm not really good at constellations, and one of the few I can distinguish is Orion. One of the stars forming Orion is very famous.
That star is Betelgeuse, the one in the upper left of the constellation. It is the only star that can be seen as a "disk"as opposed to the other stars that can only be seen as a"dot"even with the best telescope.
The reason it's so big is that it's in the final stage of a star's life cycle. This is" red giant"is very close to its fiery end, a supernova explosion.
But still, we won't know if it will explode tomorrow or 1000 years later.
If it did, it'd be instantly recognizable to us. It will become the brightest star, and we'll be able to see it even during daytime when the sun's up.
Well let's hope we won't be gone before Betelgeuse does.