Which is the Nearest Super Gaint Star to Our Earth ? A Supernova Explosion How much Light Year can end Life ?

The nearest supergiant star is Canopus, 310 light-years from our solar system.

To have any noticeable effect on the Earth's biosphere, a supernova would have to occur within roughly 100 light-years from Earth. Several prominent stars within a few hundred light-years from the Sun are candidates for becoming supernovae in as little as a millennium. One example is Betelgeuse, a red supergiant 600 light-years from Earth. Though spectacular, these "predictable" supernovae are thought to have little potential to affect Earth.

The nearest supernova candidate is IK Pegasi (HR 8210), located at a distance of only 150 light-years. This closely-orbiting binary star system consists of a main sequence star and a white dwarf, separated by only 31 million km. The dwarf has an estimated mass equal to 1.15 times that of the Sun. It is thought that several million years will pass before the white dwarf can accrete the critical mass required to become a Type Ia supernova.

Betelgeuse and Antares are the nearest red super giant stars, both of which are going to go off as a core collapse supernovae eventually. However, they're not the nearest star that can explode as a supernova, IK Pegasi is at a distance of 150 light year the closet star that will explode as a supernova. It consists of a massive 1.2 Solar mass white dwarf only 19 million miles from an A-type Main Sequence star. When that stat expands into a red giant, it will push the white dwarf's mass upwards until electron degeneracy can no longer oppose gravity. The star will collapse, runaway nuclear reactions start in the center, then they consume the entire white dwarf which will then explode as a Type 1A supernova. For a supernova to do serious damage to us, it would have to go off within 30 light years, maybe 50 light years at most. Farther away, we would be bombarded by a lot more x-rays, gamma rays and cosmic rays than usual which will have an effect upon the climate. Betelgeuse and Antares will pose no danger to us when they explode, but they will light up the sky brighter than a full moon when they do go supernova.

I just Googled "nearest supernova candidate" and the Wikipedia entry on supernovae came up at the top of the list. A number of candidate stars for future supernovae within the Milky Way are listed. The closest is stated to be IK Pegasi, a binary star some 150 light-years distant consisting of a main sequence star and a white dwarf separated by only 31 million km. The present estimate for the mass of the white dwarf is 1.15 solar masses. Eventually the white dwarf may accrete enough mass from its companion to reach the magical 1.4 solar masses required to trigger a Type 1A supernova.

Among the other candidates listed are two well-known red supergiants, Antares and Betelgeuse, both around 600 light-years distant. (Note that the distance to Betelgeuse is often given as around 420 light-years based on measurements made by the Hipparcos satellite, a recent paper incorporating radio observations has suggested a revised distance of around 600 light-years.)

The nearest super giant star to Earth that will one day explode into a supernova is the star Antares which is 520 light years away which is basically in our neighborhood of our Milky Way galaxy. Antares is 500 times larger than our Sun & is the 15th brightest star in the sky. The lifespan of Antares is is the order of just 10's of million years and then it will explode as a supernova, sending out deadly radiation to all other stars and planets in its vicinity. Earth will most likely be greatly affected by this radiation.

In layman's terms its the top left star in Orion's belt its do to supernova if it hasn't already the government watches it everyday that's in our solar system yes the radiation can wipe us out- cheerio so live each day to the fullest

I believe its Betelgeuse.its aprox. 427.48 ly.Aldebaran its also near, but I think Aldebaran its not a Supergiant star.

This question is nonsnsical !

Your (lack of) command of the English language makes it impossible to unserstand exactly what you're asking !