Question

1) ____________ gas is used in nuclear fusion reactions to produce the energy that makes the Sun shine.
2) . A star that is much bigger than our Sun is called a _____________.

Answer 1

Answer:

The simple answer is that deep inside the core of the Sun, enough protons can collide into each other with enough speed that they stick together to form a helium nucleus and generate a tremendous amount of energy at the same time. This process is called nuclear fusion.

Explanation:

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Answer 2

Answer:

2) giant stars and supergiant stars, 1) helium