It is a supermassive black hole of the type found in most spiral and elliptical galaxies. Once you arrive at the edge of a black hole, gravity takes over. Even more challenging is the fact that as black holes go, Sagittarius A is weak. Sagittarius A is a popular destination for explorers and travellers. Answer (1 of 6): > Are humans in danger of Sagittarius A (the black hole) I was reading about the mission to capture pictures of the event horizon for two black holes. Known as Sagittarius A, the object is a staggering four million times the mass of our Sun. (Note, the equation for T is based on circumference/velocity where circ2 and v where replaces what would normally be r). The Event Horizon Telescope, which detects radio frequencies, picks this up and registers it as a bright halo around the black hole.
As this material swirls inwards at nearly the speed of light, friction heats it up and it emits energy in the form of radio waves. “This similarity reveals to us a key aspect of black holes no matter their size or the environment they live in. In both cases, the spin parameter is calculated to be a/M0.65 in order to match the orbit periods (T), as per fig. A black hole has an incredibly strong gravitational pull, and will drag any nearby gas and dust into orbit around it. The black hole is called Sagittarius A and it has never been photographed until now. The Milky Way’s black hole is huge compared to the black holes left. “If Sagittarius A* were the size of a doughnut, M87* would be the size of the Allianz Arena, the Munich football stadium just a few kilometers from where we are today,” Sara Issaoun, NASA Einstein fellow at the Harvard & Smithsonian Center for Astrophysics, told a press conference at the European Southern Observatory in Germany. THE first-ever detailed photo of the black hole at the heart of our galaxy has been revealed. Scientists had previously been able to calculate that Sagittarius A is 16 million miles (26 million kilometres) in diameter. The team compared capturing it to “trying to take a clear picture of a puppy quickly chasing its tail.” To make the black hole visible, they developed sophisticated new tools to account for the gas movement.
This is because the gas surrounding Sagittarius A* completes an orbit in just minutes compared with days to weeks for the gas orbiting the much larger M87*, causing the brightness and pattern of the gas to change rapidly. Despite being much closer to us, Sagittarius A* was significantly more difficult to capture than M87*.