All right Boys and Girls, Science Class is in session.
Open your laptops and Wiki "Betelgeuse". Yes, it really IS pronounced Beetlejuice!
Distance to objects in space is measured in terms of how far light travels in one year, because light is the fasted thing we know of. That distance is about 6 trillion miles, so you can see why a light-year can be useful for explaining vast distances that are difficult to grasp using just enormous numbers of miles.
Betelgeuse is a red giant star in the Constellation Orion. It is an enormous star larger than the orbit of Jupiter, because it is in the final stages of its life, and will, relatively soon in astronomical terms, explode into a super nova. Betelgeuse is already the most luminous object in the sky even though it is over 650 light years away from earth, so the explosion will be vastly spectacular and visible during the day all over the planet earth, potentially for weeks or months.
Consider though, that if Betelgeuse had exploded and gone Nova during the early rein of King Henry the VIII in the 1500's, the first light of the flash would still be on the way, and not visible here on Earth for another 150 years or so. If it exploded today, it would be almost 7 centuries before the first light got here, traveling at the speed of light.
Thing about that for a bit. That's the kind of distances these "interstellar" fantasies are woven upon. Many a good summer novel has been based upon such a premise and I can name off a couple of dozen it we want to convert this to a Sci-Fiction/Sci-Fantasy thread. The ugly truth is that we cannot get out of low earth orbit, nor as Spacex proved again today, easily recover and reuse chemical booster rockets to get out of the atmosphere and the bottom of the local gravity well.
Space is hard. It is based on pure physics and properly discussed in the complexities of the language of mathematics. Fantasy is easy but it will get us nowhere.