A neutron star is a stellar remnant and is no longer on the main sequence.
See related questions.
A neutron star is a stellar remnant
None of those is a main sequence star.
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If you refer to the diameter, a neutron is tiny - only 20-30 kilometers in diameter. In comparison, main sequence stars have a diameter of at least several hundred thousand kilometers.
A subgiant star is larger than a neutron star. Neutron stars are incredibly dense and compact remnants of massive stars, while subgiant stars are in a transitional phase between main sequence and red giant stages, typically larger and more diffuse than neutron stars.
A neutron star is a stellar remnant
None of those is a main sequence star.
Protostar, Main Sequence, Red Giant, Super Nova, and the Neutron Star.
A main sequence star is what is considered a typical star. Such stars are composed primarily of hydrogen and helium. They produce energy by fusing hydrogen into helium in their cores. Main sequence stars vary greatly in mass and range from a few hundred thousand to a few million kilometers across. Our sun is a main sequence star of intermediate mass. A neutron star is the collapsed remnant of the core of a large star that was destroyed in a supernova explosion. A neutron star has a mass of about 2-3 times that of the sun compacted by gravity into an area less than 40 kilometers across, making it extremely dense. A neutron star is mostly composed of neutrons.
sup.
If you refer to the diameter, a neutron is tiny - only 20-30 kilometers in diameter. In comparison, main sequence stars have a diameter of at least several hundred thousand kilometers.
A subgiant star is larger than a neutron star. Neutron stars are incredibly dense and compact remnants of massive stars, while subgiant stars are in a transitional phase between main sequence and red giant stages, typically larger and more diffuse than neutron stars.
The correct life sequence of a star starts with a protostar, which forms from a dense cloud of gas and dust. The protostar then evolves into a main sequence star, where it fuses hydrogen atoms to form helium in its core. Depending on its mass, the star will either become a red giant or a supergiant before eventually shedding its outer layers to become a white dwarf, neutron star, or black hole.
No. Red giants are not on the main sequence.
A red main sequence star would be a red dwarf or a branch red giant. To be on the main sequence, you have to have hydrogen nuclear fusion.
The sun is a main sequence star, so 1 AU.
After the main sequence stage, a star like the sun will enter the red giant phase where its core contracts and the outer layers expand. This is followed by the helium fusion stage where the star burns helium in its core. Ultimately, the fate of a star depends on its mass, which determines if it will become a white dwarf, neutron star, or black hole.