Answer:
All of the above
Step-by-step explanation:
A star is a hot, giant, massive body that is located millions of miles away. These stars appears to be shiny because of its high temperature that glows producing light. They are comprised of gases such as hydrogen and helium, and they release a huge amount of energy when two hydrogen atoms undergoes fusion.
They generally look star shaped (circular type) from earth but they are somewhat spherical in shape due to their gravity that forces them to get bulge at its equator during its rotation around its own axis.
They have a core that contains iron in them and they progressively formed after the exhaustion of the hydrogen and helium fuel.
Hence, all the given options are correct.