1. A protostar is an early part in the evolution of a star. After the collapse of the gas cloud (where it is formed), but first before it is sufficient contraction has happen to permit the entering of nuclear reactions at its core.
2. The Nebula is made up of hydrogen (97%) and helium (3%).
3. A Nebula is made into a protostar when the gas cloud collaspses.
4. There must be complete balance between gravity pulling atoms toward the center and gas pressure pushing heat and light away from the center to stay as a star.This is called equilibrium, and is verry hard to form.
1.Gravity pulls gas and dust inward toward the core
2. Inside the core, temperature increases as gas atom collisions increase.
3. Density of the core increases as more atoms try to share the same space.
4. Gas pressure increases as atomic collisions and density (atoms/space) increase.
5. The Protostar’s gas pressure RESISTS the collapse of the Nebula.
6. When gas pressure = gravity, the protostar has reached the equilibrium and stops.
1. The two options for a protostar are:
- Where the temperature is critical in the
core of a protostar is not reached, it ends up a brown dwarf. This dwarf never makes “star status.”
- When the critical temperature in the core of a protostaris reached, then nuclear fusion begins. We identify the birth of a star as the moment that it begins fusing hydrogen in the core into helium.
2. Nuclear Fusion is the reaction in which two nuclei combine to form a nucleus with the release of energy.
3. A star is a really hot ball of gas, with hydrogen fusing into helium at its core.
4. A star spends most of its life as fusing hydrogen.
5. Because it needs to make up for the lost of heat and light over the billions of years.
6. Temperature is what rises.
1. Small: 15, Low: 54, Medium: 43, Massive: 31.
2. Stars die of old Age, Bigger stars die faster than smaller stars because the bigger ones burn faster than the smaller ones.
3. Protostar – Fusion ignition – Main Sequence – Red Giant/Super Giant – White Dwarf/Black Hole.
1. 43 years
3. Neutron star
4. black dwarf
5. Neutron star or black hole
7. Helium burning
1. Increase temperature
2. It expands
3. 2/2 (continue 7 & 8)
4. Escapes into space
5. Red Giant
6. Fusion still occurs in the outer shell
8. It will die!
9. It will turn into a white dwarf
10. White Dwarf
11. Neutron Stars
3. Temperate, Density, and pressure
4. Neutron star
5. Black holes