China's Space Program News Thread


longmarch

Junior Member
Registered Member
Suggestion that China has a nihilistic approach to international space law is doubtful. China does care.
Who are you to assert authority over China's space program?
International space law? Oh, I never knew China got invited into international space community.
If you think China breaks so called International space law, go ahead and sue. Let's see how you do it? Otherwise, can I say you are bullshiting?
 

KYli

Captain
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但微博科普帳號「@北斗_玉衡」當時發文分析,運載火箭的末級火箭本身就會成為不受控的太空垃圾,「沒有人會控制已經無控的太空垃圾使其精確返回」,批評歐美國家藉機炒作事件來抹黑中國。

官媒《環球時報》則引述航天專家、小火箭公眾號創始人邢強博士,指中國運載火箭殘骸的飛行軌跡也並非「不受控」,而是經過科研人員的精密計算,並利用「火箭鈍化技術」,有意縮短在軌飛行時間,殘骸最終會落在南太平洋人跡罕至的「航天器墳場」。

However, the Weibo popular science account "@北斗_玉衡" posted an analysis at the time that the final stage of the carrier rocket itself would become uncontrolled space junk. "No one will control the already uncontrolled space junk and return it accurately. Criticize European and American countries for taking the opportunity to speculate on the incident to demonize China.

The official media "Global Times" quoted aerospace expert and founder of the small rocket public account, Dr. Xing Qiang, saying that the flight trajectory of the wreckage of the Chinese launch vehicle was not "uncontrolled," but was calculated by scientific researchers and used "rockets." Passivation technology" intentionally shortens the flight time in orbit, and the wreckage will eventually fall on the inaccessible "spacecraft cemetery" in the South Pacific.
 

siegecrossbow

Brigadier
Staff member
Super Moderator
Shoulda, woulda, the West also said lockdown was the wrong approach to COVID and that the right approach should be democracy and transparency. How did that turn out? :rolleyes:

Did you stop posting here for two years because b797 aka mig29 aka mig23 got banned and there was no incentive for you? ;)
 

Quickie

Major
Designing a single stage rocket that results in a 20 ton core undergoing uncontrolled re-entry on every launch is irresponsible and deserves to be called out as such. They should've designed and installed retro rockets to separate the core and initiate a controlled re-entry and brake-up over the ocean. This Atlas 5 mission animation shows how that's normally done:

The retrorocket is just to push back the first stage rocket away from the second stage. It wouldn't have changed the trajectory of the first stage rocket which you said broke up over the ocean. The LM-5 four boosters (equivalent to the first stage of the rocket) ended up in the ocean by the nature of its trajectory without any additional intervention.

You did not mention the second stage of the rocket carrying the spacecraft to orbit. Did any of the remains of the second stage come crashing back to earth?
 

Temstar

Senior Member
Registered Member
The retrorocket is just to push back the first stage rocket away from the second stage. It wouldn't have changed the trajectory of the first stage rocket which you said broke up over the ocean. The LM-5 four boosters (equivalent to the first stage of the rocket) ended up in the ocean by the nature of its trajectory without any additional intervention.

You did not mention the second stage of the rocket carrying the spacecraft to orbit. Did any of the remains of the second stage come crashing back to earth?
No, LM-5B core stage is separated from payload under spring power not retro-rocket. They talked about this during the live broadcast of the launch.

Either the people on the broadcast are wrong (which seems unlikely), or else if there are retro-rockets then it must be for deorbiting burn.
 

nlalyst

Junior Member
Registered Member
Anglos criticising China? Suprise, suprise! Never seen before! Truly an objective voice with no ulterior motives that deserves to be heard.
Just give it up and stop embarrassing yourself. The Russian space agency Roscosmos declared yesterday that Long March 5B was set for uncontrolled reentry.
 

nlalyst

Junior Member
Registered Member
The retrorocket is just to push back the first stage rocket away from the second stage. It wouldn't have changed the trajectory of the first stage rocket which you said broke up over the ocean. The LM-5 four boosters (equivalent to the first stage of the rocket) ended up in the ocean by the nature of its trajectory without any additional intervention.

You did not mention the second stage of the rocket carrying the spacecraft to orbit. Did any of the remains of the second stage come crashing back to earth?
There is no second stage on the LM-5B (unless you count the boosters). The problem is that the core stage reached orbit and is now tumbling in space with apparently no means to deorbit in a controlled manner. The core stage of Atlas V does not reach orbit by design.

In order to avoid rockets falling over our heads, standard practice calls for one of two things, according to McDowell.

  • The rocket stage is built with a booster to steer it into a safe landing point in the water after it reenters Earth’s atmosphere, or ...
  • built with a rocket stage with some kind of stabilization system and a restartable engine whereby you can slow it down and turn it 180 degrees to land in the ocean.
China’s Long March 5B was not built with either of those options. “And so it's just left in orbit the old fashioned way to reenter uncontrolled and that is very unusual nowadays,” McDowell says.

Although there are no international regulations that stipulate rockets be built with this in mind, it is a best practice by space agencies around the world.
“When they did that design, they should have stopped and thought, ‘you know, that's going to leave a big chunk of debris in orbit, we should change the design of the engine’,” McDowell says. “But they didn't. This is real negligence.”

NASA standard practice of disposing upper stages.

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Accepted disposal strategies for upper stages include:
1. reentry within 25 years. Risk of human casualty must be less than 1:10000. Because of their small size (just 10% of LM-5B core), the danger the Centaur uppers stages present is far smaller.

2.
- storage orbit between 2000km and 19700km
- storage orbit between 20700km and 35300km
- storage orbit above 36100km

3. Direct retrieval: retrieve the structure and remove it from orbit as soon as practical after completion of mission.
 
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nlalyst

Junior Member
Registered Member
No worries, I have put you in my ignore list long time ago. I only realized your BS after seeing responses by other members. And I only made the reply not because there is a value to reason with you but rather I enjoy punching the bag.
LOL. This is already the third time you pop up to remind me that you are ignoring me.

How about you finally get over me and move on?
 

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