* E is energy
* m is mass
* c is the speed of light
Here's a breakdown:
1. Nuclear Fusion: In the Sun's core, hydrogen atoms fuse to form helium. This process releases a tremendous amount of energy.
2. Mass-Energy Equivalence: The total mass of the helium produced is slightly less than the total mass of the four hydrogen atoms that were fused. This difference in mass, known as the mass defect, is converted into energy.
3. Energy Release: This energy is released in the form of photons (light) and neutrinos. The photons travel outwards, eventually reaching the Earth as sunlight.
Why does mass decrease?
* Binding Energy: The helium nucleus is more tightly bound than the individual hydrogen nuclei. This means that the helium nucleus has a lower potential energy than the individual protons and neutrons that make it up.
* Energy is Mass: The difference in binding energy is released as energy, which is equivalent to a small decrease in mass according to E=mc².
The Significance of Mass Loss:
The mass loss during fusion in the Sun is incredibly small for each individual fusion event. However, the sheer number of fusion reactions happening in the Sun's core every second results in a significant loss of mass over time. This lost mass is what fuels the Sun's energy output and keeps it shining.
To put it in perspective:
* The Sun loses about 4 million tons of mass every second due to fusion.
* This is equivalent to the mass of about 100 million elephants per second!
* Despite this enormous loss, the Sun has enough hydrogen fuel to continue burning for billions of years.
