As Zhao Lan thought, Lobachevsky space is just a space in mathematical concepts, it is a space described by Lobachevsky geometry. There are many peculiar phenomena in this space. For example, in this space, the pi is larger than the normal space, and the sum of the interior angles of the triangle is smaller than the normal space. At the same time, in Roche space, at least two parallel lines can be made by passing a point outside the line, and a circle may not necessarily be made by passing three points that are not on the same line... and so on.
This was originally just a concept in mathematics, but in this record, Li Yunfan said that he found such a space in the real cosmic space, and confirmed it through field measurements.
