Question

E=mc2 sun is losing 4.3 billion kg mass each second ? can you let me know why ?

Answer 1

Yes I can. You've come to the right place. The reason is because that's where the sun's energy comes from. The sun converts that much mass into energy every second. Then the energy leaves the Sun and shines out into space. A tiny tiny tiny tiny tiny bit of it hits the Earth and it sustains life on Earth.