Continuing our top 10 ranges, today we will write about top 10 largest cities in the world by land area.
3500-kilogram infrared space telescope Herschel launched in 1990 on height of 1,5 million kilometers over Earth, made interesting discovery. During long supervision over our galaxy, the European astronomical observatory recorded hot molecular gas, which falls into a supermassive central black hole. Our local black hole is located in the region known under the name Sagittarius of A *. This compact radiation source is at distance about 26 000 light years from our Solar System. The mass of the central object makes 4,3 million mass of the Sun. The huge number of a dust lays in the plane of our galaxy between its edges and the center, complicating us and our orbital telescopes the most part of visibility in the visible wave range. However, such hidden areas of our galaxy are available to the infrared Herschel tools also. During the supervision,the space telescope Herschel found a large number of simple molecules nearby our central black hole (the neutral and ionized carbon, neutral oxygen and the ionized nitrogen, and also water vapor), and except them and hot molecular gas, which falls into a huge supermassive black hole.
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