I have heard a lot about Betelgeuse exploding in 2022. But, I had a doubt about this. Astronomers are still receiving signals from Betelgeuse. And if Betelgeuse is going to explode in 2022, then wouldn't we see the exploding of Betelgeuse in the night sky, 642 years later? Has Betelgeuse already exploded? If it has, how are astronomers able to still receive signals from Betelgeuse?
Most of what is observed in the cosmos occurred some time ago. The more distant an object is the longer it has taken for the light from that object to reach our location.
If Betelgeuse has exploded we don't know about it yet. Betelgeuse is 724 light years away. If it is going to explode in 2022, we won't see it until 2746 CE. If we do see it explode in 2022, the explosion occurred in 1298 CE
Has Beteleguse exploded? No, as we have not seen the explosion.
From the reference frame of the Earth we have not seen it explode (yet). It does not matter that in Betelgeuse's frame it may have exploded already. When people discuss what happens to any object in the Universe we are always talking about what we have seen on Earth. Just because it takes a long time for us to receive the signal is irrelevant, all that matters is what we have seen.
All this recent Betelgeuse hype is artificially inflated, we have absolutely no way of predicting the timeline with such accuracy and resolution. It is just the tabloids' way of exploiting the topic that allows for perpetual hype. The tabloids you are talking about, saying it's exploding in 2022, probably intend to mean that the event of its explosion will supposedly be visible from Earth in 2022, not that the actual explosion itself will occur in 2022 (with the exercise left to reader to find out that the explosion will already have occurred hundreds of years ago if it is to be visible from Earth in 2022).
If nothing changes from our perspective in 100 years, the lowest quality tabloids from 2121 will still be exploiting this subject with overinflated hype and tell you that Betelgeuse's explosion will supposedly be visible from Earth in 2122.