An H-R diagram can be used to represent a star model and show the main sequence where stars spend 90% of their lifespan. Nuclear fusion occurs in the core, convection transfers heat, and radiation releases energy into space. The Sun has a ratio of approximately 75% hydrogen and 25% helium.
Diagram or Illustration of Star Model:
A star model can be represented using an H-R (Hertzsprung-Russell) diagram.
This diagram shows the relationship between a star's luminosity (or brightness) and its surface temperature.
On the diagram, the main sequence represents the stage where stars, including our Sun, spend around 90% of their lifespan.
1. Radiation, nucleosynthesis, and charged particles are involved in the process of nuclear fusion within a star. Nuclear fusion occurs in the core, where high temperatures and pressures allow hydrogen nuclei (protons) to fuse and create helium and release energy.
2. The timeline of the approximate lifespan of the Sun can be divided into several stages.
These include the protostar stage, the main sequence stage, the red giant stage, and eventually the white dwarf stage. The protostar stage is when a star forms from a collapsing cloud of gas and dust.
The main sequence is the longest stage where the fusion of hydrogen to helium occurs.
The red giant stage happens when the core runs out of hydrogen and starts burning helium.
Finally, a white dwarf is formed when a red giant sheds its outer layers and the remaining core becomes a dense, hot object.
3. The ratio of hydrogen to helium in our Sun is approximately 75% hydrogen and 25% helium.
This ratio changes slightly over time as the Sun consumes hydrogen and converts it into helium through nuclear fusion.
4. The location of nuclear fusion, convection, and radiation in the Sun is based on its current age.
Nuclear fusion occurs in the core, where high temperatures and pressures allow hydrogen nuclei to fuse and create helium.
Convection transfers heat energy from the core to the outer layers of the Sun through the movement of hot, buoyant plasma.
Radiation occurs when the energy generated by nuclear fusion reaches the surface of the Sun and is released into space in the form of electromagnetic radiation.