What is the root number 2 1 _ what is the root number 2 1?

What constellation is 65438+February 2 1?

65438+February 2 1 is Sagittarius.

Sagittarius (date of birth165438+1October 23rd-65438+February 2nd1).

Sagittarius, also known as Sagittarius, is a fire sign. The main star is Jupiter. Sagittarius is good at philosophical thinking, full of lofty sense of justice, optimistic, unrestrained and has many ideals. It's just that people feel irresponsible and sometimes blindly optimistic because they are outspoken and careless.

sagittarius a

Sagittarius A is a complex and intense radio source in the direction of the center of the Milky Way, and also a powerful infrared and X-ray radiation source. However, it cannot be directly observed by visible light because it is covered by a large amount of cosmic dust in the spiral arms of the Milky Way. Astronomers have long speculated that these rays may be related to the activity of black holes.

Sagittarius A consists of three parts: East Sagittarius A, West Sagittarius A and Sagittarius A*. German scientists confirmed in February 2008 that Sagittarius A*, which is 26,000 light years away from the Earth, is indeed a supermassive black hole (the mass is about 43 1000 times that of the sun).