Question

we know that the sun is losing mass every second. Then why will the sun increase its size at the end of its life?​

Answer 1

Answer:

The second way the Sun loses mass is through nuclear fusion. The Sun fuses hydrogen into helium in its core, producing its life-giving glow over billions of years. ... So the Sun loses about 5.5 million tonnes of mass every second, or about 174 trillion tonnes of mass every year.