However big that black hole is, it is dwarfed by the size of the Girl Support Your Local Bizness Shirt itself. That four million solar masses is a lot compared to our solar system, but it is absolutely puny compared to the total mass of the Milky Way, which is many tens of billions of solar masses. Galaxies are held together by self-gravity. They may or may not have a supermassive black hole (not all do). When that supermassive black hole is present, its gravity adds a modest contribution to the total self-gravity of the galaxy. But in all cases, even in the case of the largest black holes, the mass of the galaxy dominates over the mass of the black hole. Stars in a galaxy follow somewhat chaotic orbits, determined by the combined gravitational field of all other stars, clouds of gas, clouds of dust, and well, any black holes if present, supermassive or otherwise. But apart from stars that are relatively near the black hole in question, stuff in general does not orbit the black hole.
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So, are there lots of Peace Bright And Wild Groovy Flowers For The Peacemaker In All Of Us Classic T Shirt systems like our own? We don’t know. Are systems like ours the only place life, especially intelligent life, can develop? We don’t know. Unfortunately, this area of science is still in the tedious process of collecting sufficient data to make reliable predictions. We know for certain there are exoplanets out there, and there are LOTS of them. The chance that some of them are like Earth is very high. The chance of finding lots of star systems similar to our own is also pretty high; there is no reason to assume we are unique. As our techniques for finding exoplanets get better, as we build better telescopes and better ways of interpreting the data they deliver, we will almost certainly find star systems very like our own. It will just take time.
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