Question

What is the primary energy source of young stars in the solar system?

Solar radiation
Gravitational energy
Fusion of hydrogen into helium
Nuclear fission

Answer 1

The primary energy source of young stars in the solar system is **fusion of hydrogen into helium**. During the main sequence phase of a star's life, it fuses hydrogen atoms in its core to produce helium, releasing a significant amount of energy in the form of light and heat. This process is what powers the star and allows it to shine.