Stars are celestial bodies that emit light. There are pseudo-stars and real stars. Artificial star is a star that do not produce their own light but reflect light received from another star. The real stars are the stars that produce their own light. In general, the star designation is the outer space objects that produce light of its own (real star).Therefore,
white dwarfs and neutron stars which emit no light or energy is called the fixed stars. The nearest star to Earth is the Sun at a distance of about 149,680,000 kilometers, followed by Proxima Centauri in the constellation Centaurus is about four light years.Energy generated by stars, as a byproduct from nuclear fusion reaction, emitted into space as electromagnetic radiation and particle radiation. Particle radiation emitted by stars is manifested as the stellar wind (which is tangible as the beam still electrically charged particles such as free protons, alpha particles and beta particles originating from the outermost parts of the star) and the fixed beam neutrinos originating from the stellar core.
Almost all of the information we have about a more distant star from the Sun derived from observations of electromagnetic radiation, which extends from radio wavelengths to gamma rays. However, not all of these wavelength ranges can be accepted by the telescope off the Earth. Only radio waves and light waves that can be transmitted by the Earth's atmosphere and create a 'window' radio and 'optical window'. Space telescopes have been launched to observe the stars at other wavelengths.
Number of electromagnetic radiation emitted by stars is influenced mainly by surface area, temperature and chemical composition from the outside (photosphere) is a star. In the end we might expect the conditions inside the star, because what happens at the surface must have been greatly influenced by the deeper part.
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