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A star is a luminous spheroid of plasma held together by self-gravity. The nearest star to Earth is the Sun. Many other stars are visible to the naked eye at night; their immense distances from Earth make them appear as fixed points of light.
- Star+
Star+ (Star Plus; estilizado como ST★R+) es un servicio de...
- Star Wars
Star Wars, conocida también en español como La guerra de las...
- Lists of stars
By physical characteristic. List of brightest stars. List of...
- Star+
A simple chart for classifying the main star types using Harvard classification. In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
Astronomers think there is a very large number of stars in the Universe. The observable Universe contains more than 2 trillion (10 12) galaxies [2] and, overall, as many as an estimated 1 × 1024 stars [3] [4] (more stars than all the grains of sand on planet Earth ). [5]
Nuclear fusion powers a star for most of its existence. Initially the energy is generated by the fusion of hydrogen atoms at the core of the main-sequence star. Later, as the preponderance of atoms at the core becomes helium, stars like the Sun begin to fuse hydrogen along a spherical shell surrounding the core.
