A research team from the University of Berne in Switzerland reported in the American magazine Science that the comet detector Rosetta entered the orbit around the target comet in early August of 20 14, and more than 50 analysis results sent back by the detector within one month showed that the proportion of heavy hydrogen in the water vapor of comet Churyumov-Gerasimenko was more than three times that of the former, which was higher than that of comet Halley.
Researchers believe that this shows that the characteristics of Jupiter's comet are not as consistent as previously thought. The water on the earth may come from other Jupiter comets or other types of celestial bodies. Where the water on the earth comes from is still a mystery.
In addition, many asteroids between the orbits of Mars and Jupiter contain heavy hydrogen in a proportion similar to that of water on Earth. Although the water content of asteroids is low, a large number of asteroids hit the earth, which may also lead to the birth of earth water.
Extended data
The orbital period of Halley's Comet is 76 ~ 79 years, and the next perihelion will be July 28th, 20061year. Halley's comet was the first periodic comet recorded. At the latest in 240 BC, or 466 BC, there were clear records in China, Babylon and medieval Europe, but I didn't know it was the reappearance of the same comet.
According to Zhu Wenxin's textual research, there are 29 records from the seventh year of Qin Shihuang (240 BC) to the second year of Xuantong in Qing Dynasty (19 10), which are consistent with the calculated results.
People's Network-Mysteries abound, and there is no conclusion yet.
Baidu encyclopedia-halley's comet