Which are the five stars that will die any moment?

Question

Plz give me correct spellings.

Answer 1

If only we could know! I have to presume that you are talking only about stars in our galaxy. As Roger That tells you stars are being born and dying all the time and one wonders why these are not visible every night.

Well, the fact is that in our galaxy there have been less than ten stars that died in the whole of recorded human history! The last one to do so was in 1987 and the last one before that was in 1604 and the one before that was in 1572. Imagine that! There were people who got to see two stars go supernova in their lifetime!

So, the short answer is that no one knows exactly which star will die, or more properly, go supernova, next. We know that a star will supernova sometime but there is no way that we know of today to tell which star and there is no way to know when.

Having said this you should also know this strange fact: If you go out to look at the night sky there may be stars that you see that are not, in fact, there anymore. In other words, we know that there are many, many stars that we see now that have, in fact, already gone supernova. We don’t know that yet because the light from that stellar explosion has not yet reached earth.

For example, the supernova of 1987 actually occurred 179,000 years ago. This means that for 179,000 years people (Myself included if I lived in the southern hemisphere from where this star is visible.) have looked at this star but it actually was not there!

Answer 2

Were you told that there are 5 stars that can die at any minute? If so, where because here is all I can find:

We usually talk of star formation in terms of the gas mass that is converted into stars each year. We call this the star formation rate. In the Milky Way right now, the star formation rate is about 3 solar masses per year (i.e. three times the mass of the Sun's worth of star is produced each year). The stars formed can either be more or less massive than the Sun, though less massive stars are more numerous. So roughly if we assume that on average the stars formed have the same mass as the Sun, then the Milky Way produces about 3 new stars per year. People often approximate this by saying there is about 1 new star per year.

Now what about the rate at which stars die? In typical galaxies like the Milky Way, a massive star should end its life as a supernova about every 100 years. Less massive stars (like the Sun) end their lives as planetary nebulae, leading to the formation of white dwarfs. There are about one of these per year.

Therefore we get on average about one new star per year, and one star dying each year as a planetary nebula in the Milky Way. These rates are different in different types of galaxies, but you can say that this is roughly the average over all galaxies in the Universe. We estimate at about 100 billion the number of galaxies in the observable Universe, therefore there are about 100 billion stars being born and dying each year, which corresponds to about 275 million per day, in the whole observable Universe.