Types of stars

Types of stars

This animation demonstrates the process of star development for average and massive stars.

Geography

Keywords

star, star development, nebula, red giant, planetary nebula, white dwarf, red supergiant, supernova, neutron star, black hole, astronomical object, astronomy, geography

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Scenes

  • - In massive stars, nuclear fusion slows down as hydrogen is consumed, and the core begins to shrink as the radiation pressure decreases. The fusion of helium nuclei begins in the core, while the outer layer enlarges and the star turns into a red supergiant. One of the largest known stars of the Universe is VY Canis Majoris, with a diameter 1,400 times greater than that of the Sun. In a red supergiant, increasingly heavier elements are formed during nuclear fusion, but since elements heavier than iron do not form, the release of energy stops and the star's core begins to shrink again. Due to the enormous mass, the increasing pressure cannot stop the shrinking process, and protons and electrons are squeezed into neutrons.
  • - They are typically 10–20 km (6.2–12.4 mi) in diameter, their mass is 1–2 times that of the Sun. Their density is enormous: one cm³ (0.06 cu in) of their matter weighs approximately a hundred million tonnes.

  • - In massive stars, nuclear fusion slows down as hydrogen is consumed, and the core begins to shrink as the radiation pressure decreases. The fusion of helium nuclei begins in the core, while the outer layer enlarges and the star turns into a red supergiant. One of the largest known stars of the Universe is VY Canis Majoris, with a diameter 1,400 times greater than that of the Sun. In a red supergiant, increasingly heavier elements are formed during nuclear fusion, but since elements heavier than iron do not form, the release of energy stops and the star's core begins to shrink again. Due to the enormous mass, the increasing pressure cannot stop the shrinking process, and protons and electrons are squeezed into neutrons.
  • - They are typically 10–20 km (6.2–12.4 mi) in diameter, their mass is 1–2 times that of the Sun. Their density is enormous: one cm³ (0.06 cu in) of their matter weighs approximately a hundred million tonnes.

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