GENERAL KNOWLEDGE

Detailed explanation-1: -A red giant is a dying star in the final stages of stellar evolution. In about five billion years, our own sun will turn into a red giant, expand and engulf the inner planets-possibly even Earth.

Detailed explanation-2: -A red giant is formed. This process can take hundreds of millions of years and applies to intermediate mass stars (with a mass greater than 80% and less than 800% of the Sun’s mass), which then go on to form planetary nebulae.

Detailed explanation-3: -A: Roughly 5 billion years from now, the Sun will exhaust the hydrogen fuel in its core and start burning helium, forcing its transition into a red giant star. During this shift, its atmosphere will expand out to somewhere around 1 astronomical unit-the current average Earth-Sun distance.