In 48 BC, more than 2,000 years ago, astronomers in ancient China witnessed the explosion of a new star about 1600 light years away. This phenomenon is recorded in Hanshu: in April of the first year of the early Han Dynasty, the guest star was as big as a melon and the color was blue and white. It's two stars in the south and four feet in the east.
198 1 year, I published a paper in Astrophysics, "Gade discovered Io two thousand years before Galileo". This article is based on several sentences of Zhan Jing in Kaiyuan in Tang Dynasty. West Zong Ze demonstrated and speculated that Gande in the Warring States period had discovered Io in 364 BC. Since then, the astronomical community has quickly carried out experimental tests on this, and both simulation verification and actual observation verification have confirmed this new discovery.
During the Warring States Period, there were many astronomers in China who could verify their names, among which Shi Shen of Qi and Gan De of Wei were the most famous. Unfortunately, their works have not been handed down. Fortunately, this part of the content was preserved in Kaiyuan Zhan Jing in the Tang Dynasty, which recorded a passage of Gander talking about Jupiter, including one sentence, "If it is flanked by a small red star, it is an alliance", which attracted the attention of the West. Combined with the context mentioned by Gander, it should mean that the "little red star" is attached to Jupiter and combined with Jupiter into a system. In addition, "red" is light red, which is also consistent with the color of four io. It is because of this analysis that Lucy thinks that what is recorded here may be that Gander discovered Io.