Question

a large star at least 1 1/2 times bigger than the sun is nearing its end

Answer 1

The Antares is a large star, at least 1 1/2 times bigger than the sun which is nearing its end.

Antares is also known as alpha Scorpii or the Red Star. It is a prominent star which is found in the Scorpius constellation in the Northern Hemisphere.  When there will be no fuel to burn, this star would collapse and explode.