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Sagittarius A*: https://en.wikipedia.org/wiki/Sagittarius_A\\\\ https://en.wikipedia.org/wiki/Sagittarius_A\\\\* : > Astronomers have been unable to observe S
by westurner 2y ago
Sagittarius A*:
https://en.wikipedia.org/wiki/Sagittarius_A\\\\ https://en.wikipedia.org/wiki/Sagittarius_A\\\\* :
> Astronomers have been unable to observe Sgr A* in the optical spectrum because of the effect of 25 magnitudes of extinction (absorption and scattering) by dust and gas between the source and Earth. [26]
> [...]
> In May 2022, astronomers released the first image of the accretion disk around the horizon of Sagittarius A*, confirming it to be a black hole, using the Event Horizon Telescope, a world-wide network of radio observatories. [13] This is the second confirmed image of a black hole, after Messier 87's supermassive black hole in 2019. [14][15] The black hole itself is not seen; as light is incapable of escaping the immense gravitational force of a black hole," only nearby objects whose behavior is influenced by the black hole can be observed. The observed radio and infrared energy emanates from gas and dust heated to millions of degrees while falling into the black hole. [16]*
EHT: Event Horizon Telescope: https://en.wikipedia.org/wiki/Event_Horizon_Telescope https://en.wikipedia.org/wiki/Event_Horizon_Telescope
First EHT image of Sagittarius A*:
(2017, 2022)
https://commons.wikimedia.org/wiki/File:EHT_Saggitarius_A_black_hole.tif#mw-jump-to-license https://commons.wikimedia.org/wiki/File:EHT_Saggitarius_A_bl...
- westurner 2y ago/? How does the rotation of our solar system relate to the rotation of Sagittarius A* https://www.google.com/search?q=How+does+the+rotation+of+our+solar+system+relate+to+the+rotation+of+Sagittarius+A\\\\\\\ https://www.google.com/search?q=How+does+the+rotation+of+our...* Milky Way > Astrography > Sun's location and neighborhood: https://en.wikipedia.org/wiki/Milky_Way#Sun's_location_and_neighborhood https://en.wikipedia.org/wiki/Milky_Way#Sun's_location_and_n... : > The apex of the Sun's way, or the solar apex, is the direction that the Sun travels through space in the Milky Way. The general direction of the Sun's Galactic motion is towards the star Vega near the constellation of Hercules, > at an angle of roughly 60 sky degrees to the direction of the Galactic Center. > The Sun's orbit about the Milky Way is expected to be roughly elliptical with the addition of perturbations due to the Galactic spiral arms and non-uniform mass distributions. In addition, the Sun passes through the Galactic plane approximately 2.7 times per orbit. [109] [unreliable source?] This is very similar to how a simple harmonic oscillator works with no drag force (damping) term.* [...] > It takes the Solar System about 240 million years to complete one orbit of the Milky Way (a galactic year), [112] so the Sun is thought to have completed 18–20 orbits during its lifetime and 1/1250 of a revolution since the origin of humans. > The orbital speed of the Solar System about the center of the Milky Way is approximately 220 km/s (490,000 mph) or 0.073% of the speed of light. > The Sun moves through the heliosphere at 84,000 km/h (52,000 mph). At this speed, it takes around 1,400 years for the Solar System to travel a distance of 1 light-year, or 8 days to travel 1 AU (astronomical unit). [113] The Solar System is headed in the direction of the zodiacal constellation Scorpius, which follows the ecliptic. [114] From an Answer to "Does our solar system orbit Sagittarius A (location of the SMBH)?" https://www.quora.com/Does-our-solar-system-orbit-Sagittarius-A-location-of-the-SMBH/answer/Lucas-Curtis?ch=15&oid=38519061&share=608a0791&srid=p4lp&target_type=answer https://www.quora.com/Does-our-solar-system-orbit-Sagittariu... : > [...] Think about this: the mass of the entire Milky Way galaxy is about 1 trillion solar masses; however, Sgr A is only about 4 million solar masses: about 0.0001% of the galaxy’s total mass. The force that is most responsible for keeping the solar system in orbit around the galaxy is not Sgr A, but the gravity of the galaxy itself. > Need evidence? Consider the fact that as the Sun moves around the galaxy, it also bobs “above” and “below” the galactic plane. It’s orbital path resembles the edge of a warped record instead of a flat ellipse. This wouldn’t happen if the Sun were simply orbiting a point mass in the center of the galaxy, but it makes perfect sense if the Sun is being tugged “up” and then “down” by the galaxy’s collective gravity. > So yes, the Sun is orbiting around a point corresponding to the location of Sgr A, but no, the Sun is not just orbiting Sgr A.