The exposed hot, dense core left after a star dies is called what?

The exposed hot, dense core left after a star dies is called what?

• A. Neutron Star
• B. White Dwarf
• C. Black Hole
• D. Nebula

Answer: (B)

When stars like the Sun exhaust their fuel, they shed their outer layers and leave behind what’s left as a hot, dense remnant. For these lower- to intermediate-mass stars, the remaining core is supported by electron degeneracy pressure rather than by thermal pressure, so it remains stable as a white dwarf. It starts out very hot, shining by residual heat, and will gradually cool over billions of years; the expelled outer layers form a beautiful planetary nebula around it. This outcome is distinct from other possibilities. A neutron star comes from a much more massive star that collapses in a supernova, leaving a core so dense that neutrons provide the pressure support. A black hole would form only if the remnant is even more massive and collapses beyond neutron-star density. A nebula isn’t a remnant core at all—it’s the cloud of gas and dust ejected around the dying star. So the exposed hot, dense core left after the death of a Sun-like star is a white dwarf.

When stars like the Sun exhaust their fuel, they shed their outer layers and leave behind what’s left as a hot, dense remnant. For these lower- to intermediate-mass stars, the remaining core is supported by electron degeneracy pressure rather than by thermal pressure, so it remains stable as a white dwarf. It starts out very hot, shining by residual heat, and will gradually cool over billions of years; the expelled outer layers form a beautiful planetary nebula around it.

This outcome is distinct from other possibilities. A neutron star comes from a much more massive star that collapses in a supernova, leaving a core so dense that neutrons provide the pressure support. A black hole would form only if the remnant is even more massive and collapses beyond neutron-star density. A nebula isn’t a remnant core at all—it’s the cloud of gas and dust ejected around the dying star. So the exposed hot, dense core left after the death of a Sun-like star is a white dwarf.