Question

elements forged in stars:

1. stars turn lighter elements into:
2. hydrogen atoms fuse to form: helium
3. fusing hydrogen is about ______% of a stars life.
4. when the stars run out of hydrogen they start to fuse ____ to make ____.
5. then eventually oxygen and ______.
6. once ______ forms the star starts to die.

Explanation:

1. Stars convert lighter elements into heavier ones through nuclear fusion.
2. Hydrogen atoms fuse to form helium in the core of stars via nuclear fusion.
3. Fusing hydrogen typically accounts for about 90% of a star's life as it is the most stable and long - lasting phase of stellar evolution.
4. When hydrogen is depleted, stars start fusing helium to form carbon.
5. Eventually, oxygen and carbon can further fuse to form heavier elements.
6. Once iron forms in the core of a star, the star starts to die as iron fusion does not release energy but absorbs it, leading to a collapse.

Answer:

1. Heavier elements
2. Helium
3. 90
4. Helium; Carbon
5. Carbon
6. Iron