Sun – Morning Star

              Sun – Morning Star

sun_1_24096300 Sun (asters. ☉) – the only star of the Solar System. Around the Sun seek other objects of this system: the planets and their moons, dwarf planets and their moons, asteroids, meteorites, comets and cosmic dust. The mass of the Sun is 99.866% of the total mass of the entire solar system. [7] Solar radiation support life on Earth [8] (light required for the initial stages of photosynthesis), determines the climate. Sun consists of hydrogen (≈73% by weight and ≈92% by volume), helium (≈25% by weight and ≈7% by volume of [9]), and other elements with a lower concentration of iron, nickel, oxygen, nitrogen, silicon, sulfur, magnesium, carbon, neon, calcium and chromium [10]. 1 million hydrogen atoms have 98 000 helium atoms, an oxygen atom 851, 398 carbon atoms, 123 atoms neon, nitrogen atoms 100, 47 iron atoms, magnesium atoms 38, silicon atoms 35, 16 sulfur atoms, 4 argon atom, aluminum atom 3 at 2 atoms of nickel, sodium and calcium, as well as small amounts of other elements. The average density of the Sun is 1.4 g / cc. According to the spectral classification of the Sun is a type G2V («Yellow Dwarf”). The surface temperature of the sun reaches 6000 K. Therefore, the sun shines almost white light, but direct light of the sun on the surface of our planet gets some yellow tint due to the strong scattering and absorption of short-wavelength part of the spectrum of the Earth’s atmosphere (under a clear sky, with a blue light scattered by sky, sunlight newly gives white light).                                                                                                                                              Superman-Sun-Powers The solar spectrum contains lines of ionized and neutral metals as well as hydrogen and helium. In our Milky Way, there are over 100 billion stars. [11] At the same time 85% of the stars in our galaxy – stars is less bright than the sun (mostly red dwarfs). Like all the stars of the main sequence, the Sun generates energy by nuclear fusion. In the case of the vast majority of the sun’s energy is generated in the synthesis of helium from hydrogen.                                                      22_sun   Distance of the Sun from the Earth, 149,600,000 kilometers, approximately equal to the astronomical unit, and the apparent angular diameter as seen from Earth as the moon – a little more than half a degree (31-32 minutes). The sun is located about 26,000 light-years from the center of the Milky Way and revolves around him, making a turnover of more than 200 million years. [12] The orbital velocity of the Sun is 217 km / s – so it goes one light-year of 1400 Earth years, and one astronomical unit – 8 Earth days [13]. Currently, the Sun is in the inner edge of the Orion arm of our Galaxy, the Perseus arm and between the Sagittarius arm, the so-called “Local Interstellar Cloud” – areas of high density disposed in turn, having a lower density in the “Local Bubble” – the area of ​​the scattered high temperature of interstellar gas. From the stars belonging to the nearest 50 star systems within 17 light-years, well-known at the moment, the Sun is the fourth brightest star (its absolute magnitude + 4,83m).                                                                                                                                                                                                                                  source: wikipedia

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