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For a long time, we know little about the Milky way. We don't even know the specific position of the sun in the Milky way. 

However, astronomers have recently made use of some observation data to draw a new &uot;Galactic map&uot;, which will refresh our understanding of the formation of the galaxy. 

And from this map, we also know that the sun is almost exactly on the central plane of the galactic disk.

Hundreds of years ago, explorers made detailed maps across the unknown continent. Over the past half century, space probes launched by humans have photographed most of the solar system.

However, although we already know the solar system as an astronomical backyard, we don't know enough about our own large cosmic community, the Milky way. 

The reason is obvious, just as &uot;we don't know the true face of Lushan Mountain, but only because we are in this mountain&uot;, we can't leave the galaxy and look back at the panorama of the galaxy.

Maybe you can dream that we can launch a spacecraft, let it leave our galaxy, and then return to take a panoramic picture of the galaxy, but the spacecraft can only do this after millions of years of journey, 

which is obviously unrealistic. We still have many unsolved uestions about the Milky way, such as how many spiral arms the Milky way has, whether a large structure closest to the sun can be counted as an independent spiral arm, 

and where our solar system is in the Milky way.

Recently, however, scientists are trying to map the galaxy from the inside out, so that they can map the structure of the galaxy accurately for the first time. 

This bright prospect is the result of joint efforts of several advanced radio and optical large-scale telescope projects, including our leading &uot;bar and spiral structure legacy survey&uot; 

(Bessel plan for short). We have obtained a very long baseline array with an unprecedented observation time of 5000 hours.

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