Question

answer the following questions:

1. as the size of a star increases, the length of its lifetime _
2. what size star can become a blackhole? _
3. what type of star is our sun? _
4. what elements undergo fusion in a low mass star? _
5. what elements undergo fusion in a medium mass star? _
6. what elements undergo fusion in a massive star? _
7. give an example of a low mass star _
8. give an example of a medium mass star _
9. give an example of a high mass star _
10. how close is our sun to the end of its life? _

Explanation:

1. Larger stars burn fuel faster, so their lifetimes are shorter.
2. Stars with a mass more than about 20 times that of the Sun can collapse into black holes.
3. The Sun is a medium - mass star (a yellow dwarf).
4. In low - mass stars, hydrogen fuses to helium.
5. In medium - mass stars, hydrogen fuses to helium, and then helium fuses to carbon.
6. In massive stars, hydrogen fuses to helium, helium to carbon, carbon to neon, neon to oxygen, oxygen to silicon, and silicon to iron.
7. Proxima Centauri is a low - mass star.
8. The Sun (during most of its life, before the red giant phase) is a medium - mass star example.
9. Rigel is a high - mass star.
10. The Sun is about halfway through its main - sequence lifetime (about 4.5 billion years old, and main - sequence lifetime is about 10 billion years).

Answer:

1. decreases
2. A star with a mass more than about 20 times that of the Sun.
3. A medium - mass star (a yellow dwarf).
4. Hydrogen.
5. Hydrogen and helium.
6. Hydrogen, helium, carbon, neon, oxygen, silicon, and iron.
7. Proxima Centauri.
8. The Sun (in its main - sequence stage).
9. Rigel.
10. It is about halfway through its main - sequence lifetime (about 4.5 billion years old, with a main - sequence lifetime of about 10 billion years).