Stars form in molecular clouds and nebulae, consisting mostly of hydrogen, with some helium and lithium. When enough mass (along with a few other factors) accumulates, such clouds begin to collapse under their own weight, forming dense pockets of dust and gas called Bok Globules. As Bok Globules increase in mass, their cores undergo more and more pressure, and when the cloud reaches hydrostatic equilibrium, a protostar forms at the center.
The obvious reason is that the specific star has bigger density compared with the Sun. For example, that star could be a "white dwarf star". A white dwarf mostly contains "electron degenerate matter", which is very dense. A white dwarf is a small dense star.
gravity
Theoretically, an infinitely dense point of matter produced when a major star collapsed; the gravity shift and the huge amount of mass imploding creates a vaccuum which draws surrounding matter into it continuously, increasing the amount of matter but not necessarily the space it takes up; matter is crushed and compated into ridiculously small pieces.
Neutron Star
Magnitude is a measure of brightness, there is no relationship with density.
A neutron star.
"Small but very dense" sounds like the description of a neutron star or "collapsed matter star". Theoretically, a black hole (the only thing more dense) has no physical size at all. So, "neutron star". If the neutron star is spinning rapidly, they are called "pulsars" for the radio-wave pulses that they generate.
The obvious reason is that the specific star has bigger density compared with the Sun. For example, that star could be a "white dwarf star". A white dwarf mostly contains "electron degenerate matter", which is very dense. A white dwarf is a small dense star.
Gravity plays an important role in the birth of a star. It concentrates matter in the interstellar medium to the point where fusion occurs.
gravity
Gravity plays an important role in the birth of a star. It concentrates matter in the interstellar medium to the point where fusion occurs.
Studying star and star types can be fun, but it can be challenging to remember each type. A Neuron star is a dense, rapidly spinning star.
As gravity increases so the pressure within the star increases, the matter becomes more dense and hotter, more matter is fused. The star decreases in volume initially. The thermal pressure increases to maintain equilibrium.Depending on the total mass the star may then expand to a giant or 'explode' catastrophically as a nova.
What are the small dense remains of a high mass star
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White dwarf
A pulsar.