Interstellar matter and dust
Looking towards the inner spurs of our galaxy, Milkyway, from the wonderful star party at mt Parnon, Sparta
10th National Annual Star Party of Greek Amateur Astronomers
Special thanks to the Astronomical Union of Sparta!
Banquet of interstellar dust matter and looking at the internal threads of our galaxy somewhere between Centaur Sagittarius, Scutum and Serpens Cauda.
The Galactic Center is the rotational center of the Milky Way. The estimates for its location range from 7.6 to 8.7 kiloparsecs (about 25,000 to 28,000 lightyears) from Earth in the direction of the constellations Sagittarius, Ophiuchus, and Scorpius where the Milky Way appears brightest. There is strong evidence consistent with the existence of a supermassive black hole at the Galactic Center of the Milky Way.
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https://en.wikipedia.org/wiki/Galactic_Center
The main disc of our galaxy has a diameter of 80,000 to 100,000 light-years, the perimeter 250 to 300 000 light years and a thickness of about 1,000 light years. It consists of 200 up to 400 billion stars. If we define a natural scale and assume that the Milky Way has a diameter of 130 km, the solar system would have a length of 2 mm. The Galactic Halo extends over a diameter of 250,000 and 400,000 light years. As reported extensively in the galaxy structure below, new research has shown that the disk extends much more than we thought until last.
Officially, since 2005, the Milky Way is now considered to be a large barred spiral galaxy SBbc type the Hubble sequence (small barred spiral helix) with a total mass of 600 to 3,000 billion solar masses (M☉) [5] [6], comprising from 200 to 400,000,000,000 stars.
The galactic disk has an estimated diameter of about 100,000 light years. The distance of the Sun from the center of the galaxy is estimated at 26,000 light years. The disc is protuberant in the center and symperikleietai from the so-called thick disk.
The Sun (and thus the Earth and the Solar System) is quite close to the inner ring of the Arm of Orion, local cloud, at 7,94 ± 0,42 kpc from the Galactic Center. The distance between the local arm and immediately nearest, the Perseus Arm, is of the order of 1 · 1019 m (6.500 light years). The Sun and by extension the solar system, located in what scientists call the Galactic Habitable Zone.
The direction of the Sun's path (apix or corymb), refers to the direction of the Sun as it travels in the Galaxy. The general direction of galactic motion of the Sun is near the constellation Hercules, at an angle of approximately 86 degrees from the Galactic Center. The orbit of the Sun in the Galaxy is expected to be approximately elliptical with the addition of influences from the galactic arms and uneven mass distribution. We are currently 1/8 of the track before perigalaxio (the shortest distance from the center of the Milky Way).
The solar system takes about 225-250000000 years to complete an orbit (one Galactic Year), so speculation has performed approximately 20-25 orbits during its lifetime. The orbital speed of the Solar System is 217 km / sec, ie. One light-year every 1,400 years, and 1 AU in 8 days.
Canon eos 6D, Skywatcher EQ6 unguide, EF 85mm f1.2 LII, 85mm f/2.8, Iso800, 7X240sec, DSS, PS
