Greendron laughed and said, "I joined NASA in 2007. When I joined NASA, every year I heard NASA officials say that we would launch the James Webb Telescope next year."
"My colleagues who came even earlier than me started listening in 2001, and as you can see, the James Webb Telescope wasn't successfully launched until 2022."
"As for the moon landing, I heard back in 2018 that the Orion spacecraft would be used to land on the moon in 2020, and you saw it too."
"We're not going to land on the moon until 2024."
"NASA's statements are unreliable; much of what they say is just hype to get funding from Congress."
"The orbit of the lunar space station has been occupied by the Chinese, and the cost of repeating the lunar landing is several times higher than if there were a lunar space station."
"If this problem isn't solved, cost issues will continue to plague NASA for a long time."
Greendron joined the Johnson Space Center in 2007 and has been with NASA for much longer than Watkins. He is used to NASA officials' tendency to forget what they said as soon as they finished speaking.
He has always been reserved about NASA, believing that their claims are far more exaggerated than factual.
Watkins: "There isn't just one suitable space orbit."
“We can use the Gaussian pseudospectral method, by introducing the maximum offset and a fixed time interval, to calculate several suitable lunar orbits based on the baseline trajectory of the real-time data.”
Watkins also worked at NASA before becoming an astronaut, where she specialized in the Phoenix Mars Lander mission.
However, there are some differences between the lunar orbit and the orbit of Earth.
Quasi-periodic orbits in the Earth-Moon system are highly sensitive; even small errors in position or velocity can have a significant impact on their trajectory.
Therefore, the trajectory is unstable and must be controlled to maintain the appropriate orbit. Building a lunar space station is much more challenging than building an Earth space station.
It is difficult to find a relatively stable orbit. As for whether China's lunar space station orbit selection referenced NASA's research results,
This is purely coincidental, because the most stable orbit can be calculated.
A problem has only one solution. Just because America has calculated this solution doesn't mean that China can't.
Chinese experts in applied mathematics, based on a stabilization strategy for a quasi-periodic orbit around the perilunar point, considered the contributions of solar gravity and lunar eccentricity, and used standard ephemeris to derive the precise position of this quasi-periodic orbit.
NASA originally thought that only they knew about this orbit, so they were in no hurry to claim it, since it would be theirs sooner or later anyway.
However, after China's lunar space station was successfully launched, they realized that something was seriously wrong.
The originally planned track has been occupied by the Chinese.
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