China's Space Program News Thread

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silentlurker

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I think the proper translation of '长征' should be 'Long Expedition,' not 'Long March.' What do you guys think?
Well, it was named after the retreat of Communists from the Nationalists, and that event is known as the Long March. Whether that should be renamed in English, well you're a few decades late and names tend to stick.
 

taxiya

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Does anyone know when the telescope as part of China's space station gets sent up? I heard it was 300 times more powerful than Hubble.
The plan is 2024.

300 times more powerful seems kind of dubious, it will have a 2m diameter primary mirror vs Hubble at 2.4m. However no doubt the actual imaging electronic would be vastly superior to Hubble given the decades separating them, so maybe 300 times is referring to that.
According to Zhou Jianping, the FOV is 300 times of Hubble. Resolution is same.
Zhou Jianping is the chief designer of the manned space program.
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gelgoog

Lieutenant General
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...
I really cant stand another 10 more of these fake outrages..
I even had normal people who are "casuals" mention me this rocket falling on their heads..
...

The Long March 7 and Long March 2 launches won't have large second stages.
Only the ones to launch the main station modules and the telescope should use Long March 5B.
That will be like 3 launches if none of them fail.
 

Arcgem

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Well, it was named after the retreat of Communists from the Nationalists, and that event is known as the Long March. Whether that should be renamed in English, well you're a few decades late and names tend to stick.
Whether a translation should be 'faithful' or 'fluent' has been argued to death in almost every context, not just historical.

To me, 'Long March' is a fluent translation, and rightfully so. The syllables and cadence align with the original Chinese pronunciation and the historical context. All desirable qualities to carry over in the name of a rocket.

More practically, the YZ upper stage '远征' already translates to "Expedition", so there would be a name clash.
 

taxiya

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Do they even try to control the trajectory of rocket stages that has gone into orbit after releasing the payload. I doubt so as I've never heard of a ground control station trying to reestablish contact with the rocket stage, reigniting the engine after days/weeks of its orbiting the Earth. Not an easy task as the rocket stage could be tumbling and it would be impossible to stabilize the rocket in the right direction without those vernier thrusters.

This video explains why SpaceX never try to recover the second stage in orbit, the main problem being reigniting the engine.

Nobody does it.
 

taxiya

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I could be wrong but doesn't that also mean the angular resolution is 300 times worse than Hubble? Or maybe FOV is the priority for this telescope.
If the same CCD sensor has 300 times of view, then yes its angular resolution would be 1/300 when used for wide FOV. But I think there are three sets of sensors responsible for different scans.

I don't know the abbreviations GS and WFS. I guess GS means "general scan" and WFS means "Wide Field Scan"? The CCD sensor gives the highest resolution, while the WFS may give the 300 times of FOV. Of course, they must have corresponding optics. It is as if the telescope has three lenses (or one lens with 3 focal lenghs).
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voyager1

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If the same CCD sensor has 300 times of view, then yes its angular resolution would be 1/300. But I think the optic setup has two modes, first using wide FOV to give a rough scan, then narrow the FOV for detailed scan. It is like the amateur telescope that has a broad FOV view finder attached to the main tube.
So I suppose they will start taking these ultra wide scans to get a general view of the area and then focus on potential points of interest using the detailed scan?

Do you know why they are still using a similar resolution as Hubble uses.
I mean this is a 30-year old telescope. They couldnt't try to use a bigger mirror for such a project or was the technology not there?
 
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