Question

drag each tile to the correct box. arrange these phases in the partial life cycle of a star in order, starting with the earliest event. in heavy stars, the core contracts, pulling the outer layer inward. hydrogen fusion begins in the outer shell. the outer shell expands, and the light generated increases. the hydrogen supply in the core starts to run out. the outer shell expands, cools down, and starts to glow red. stars that have roughly more than three times the mass of our sun become black holes.

Explanation:

1. First, the hydrogen in the core runs out, which triggers changes. So the second tile (The hydrogen supply in the core starts to run out. The outer shell expands, cools down, and starts to glow red) comes first as it's the initial stage of core fuel depletion.
2. Then, in heavy stars, the core contracts and hydrogen fusion starts in the outer shell (first tile) as a response to core hydrogen depletion.
3. Finally, very massive stars (more than three solar masses) end up as black holes (third tile) after the previous stages.

Answer:

1. The hydrogen supply in the core starts to run out. The outer shell expands, cools down, and starts to glow red.
2. In heavy stars, the core contracts, pulling the outer layer inward. Hydrogen fusion begins in the outer shell. The outer shell expands, and the light generated increases.
3. Stars that have roughly more than three times the mass of our Sun become black holes.