berikut adalah paparan artikel berkenaan isu terbaru tentang kemasukan sampah buangan atau bhgn roket dari China ke ruangan atmosfera bumi yang diwawarkan bebaru ini.Isu bahan buangan angkasa yang dihasilkan atau terhasil daripada serpihan satelit dan roket yang melalui fasa fasa tertentu pada awal proses pengorbitannya di ruang angkasa raya bumi ATAU yang telah nyahfungsi setelah mencapai tempoh jangka hayat tertentu mungkin kelihatan seperti isu entang and lewah , namun sekiranya diamati bebetul , impak dan komplikasi jatuhan bahan buangan ini bukan juga boleh diambil ringan , atau alang kepalang.
Ada sahaja risiko serius yg wujud sepert kerosakan pada harta benda awam bergantung pada lokasi dan impak jatuhan dan juga BAHAN Jatuhan itu - dah ternyata telah berlaku dalam kes satelit russia semasa zaman perang dingin - jadi rasanya sejauh manakita bersedia mengawal selia angkasaraya kita - our own Malaysia airspace sovereignity dalam menangi isu yang semakin relevan ini, terutamanya setelah elon Musk and his idea on Space travel ni dah bermula...????
A large piece of space debris, possibly weighing several tonnes, is currently on an uncontrolled reentry phase (that’s space speak for “out of control”), and parts of it are expected to crash down to Earth over the next few weeks.
If that isn’t worrying enough, it is impossible to predict exactly where the pieces that don’t burn up in the atmosphere might land. Given the object’s orbit, the possible landing points are anywhere in a band of latitudes “a little farther north than New York, Madrid and Beijing and as far south as southern Chile and Wellington, New Zealand”.
Altitude chart
Changing altitude of the Long March 5B rocket now in uncontrolled descent back to Earth. orbit.ing-now.com
The debris is part of the Long March 5B rocket that recently successfully launched China’s first module for its proposed space station. The incident comes roughly a year after another similar Chinese rocket fell to Earth, landing in the Atlantic Ocean but not before it reportedly left a trail of debris in the African nation of Cote D'Ivoire.
At the time, experts noted this was one of the largest pieces of human-made debris ever to fall to Earth. We cannot say with certainty what fate awaits this latest piece of space junk.
Australia already holds the record in the category of “who can be hit by the biggest piece of space junk”. In 1979, the 77-tonne US space station SkyLab disintegrated over Western Australia, peppering the area around the southern coastal town of Esperance with fragments.
At the time, the event was met with with excitement and a sense of lightheartedness, and many pieces were collected by space enthusiasts. Esperance shire council flippantly issued NASA with a fine for littering, and a US radio station later raised enough money to pay the debt.
Pieces of Skylab are now on display in a local museum in regional Western Australia. James Shrimpton/AAP Image
Although there have been no recorded deaths or serious injuries from people being hit by space debris, that’s no reason to think it’s not dangerous. Just one year before SkyLab’s demise, a Soviet remote sensing (spy) satellite, Cosmos 954, plummeted into a barren region of Canada’s Northwest Territories, spreading radioactive debris over several hundred square kilometres.
With the Cold War at its height, the sensitivity of the nuclear technology on board Cosmos 954 led to an unfortunate delay in locating and cleaning up the wreckage, because of the distrust between the Soviet Union and the Canadian/US recovery effort.
The clean-up operation took months but located only a portion of the debris. Canada billed the Soviet Union more than C$6 million, having spent millions more, but was ultimately paid only C$3 million.
Since the late 1970s, pieces of space debris have fallen to Earth regularly and are viewed with increasing concern. Of course, more than 70% of Earth is covered by oceans, and only a minuscule fraction of the remaining 30% is covered by your house. But for anyone falling foul of the extremely long odds, the consequences would be truly disastrous.
It was just a quirk of fate that Cosmos 954 did not land on Toronto or Quebec City, where the radioactive fallout would have necessitated a large-scale evacuation. In 2007, pieces of debris from a Russian satellite narrowly missed a Chilean passenger plane flying between Santiago and Auckland. As we send more objects into space, the chances of a calamitous crash-landing will only increase. Who pays to clean up the mess, anyway?
International law sets out a compensation regime that would apply in many circumstances of damage on Earth, as well as when satellites collide in space. The 1972 Liability Convention, a UN treaty, imposes liability on “launching states” for damage caused by their space objects, which includes an absolute liability regime when they crash to Earth as debris.
In the case of the Long March 5B, this would impose potential liability on China. The treaty has only been invoked once before (for the Cosmos 954 incident) and therefore may not be regarded as a powerful disincentive. However, it is likely to come into play in the future in a more crowded space environment, and with more uncontrolled reentries. Of course, this legal framework applies only after the damage occurs.
Other international guidelines regarding debris mitigation and long-term sustainability of space activities set out voluntary standards intended to limit the probability of collisions in space, and minimise the breakup of satellites either during or after their missions.
Some satellites can be moved into a graveyard orbit at the end of their operational life. While this works well for certain specific orbits at a relatively high altitude, it is impractical and hazardous to start moving the vast majority of satellites around between orbital planes. Most of the millions of pieces of space junk are destined either to orbit in an uncontrollable manner for many years or, if they are in low Earth orbit, to gradually descend towards the Earth, hopefully burning up in the atmosphere before contact with terra firma.
A globally coordinated space traffic management system will be vital to avoid collisions that would result in loss of control of satellites, leaving them to tumble helplessly in orbit or fall back to Earth.
Comprehensively tracking every satellite’s movement and functionality is even harder than it sounds, because it would inevitably require countries to be willing to share information they often currently regard as confidential matters of national security.
But, ultimately, global cooperation is essential if we are to avoid an unsustainable future for our space activities. In the meantime, don’t forget to gaze upwards every now and then — you might spot some of the most spectacular litter on the planet.
semua roket bila dah berlepas, misi berjaya ke gagal ke, semua akan jadi sampah jatuh balik ke bumi. single use je semua. begitu la berpuluh tahun. space-x je yang pandai mendaratkan balik roket.
Malaysians urged not to touch, collect debris from China's out-of-control rocket should any fall here
PETALING JAYA: Malaysians have been urged not to touch or collect any debris from China's 20-tonne Long March 5B rocket in the unlikely event any of it falls within the country, says the Malaysian Space Agency (MySA).
The core of the rocket, spotted circling the Earth in an unstable orbit since Thursday (May 6), is expected to make an unstable re-entry imminently, said director-general Azlikamil Napiah on Saturday (May 8).
Azlikamil said the rocket debris was still in orbit and approaching the re-entry point.
He said the latest data shows that the debris was currently at an altitude of 198.3km and expected to fall between latitudes 41.5° North and 41.5° South anytime from 9.34am Friday (May 7) to 3.34pm on Sunday (May 9).
He also said that the exact location of re-entry could only be pinpointed a few hours before it occurs as there were still many uncertainties
"In most cases of re-entry, uncertainties loom large due to changes in the atmospheric upper layer density rate, physical properties of re-entry objects such as mass and material composition as well as the location and velocity of the object," he said.
Azlikamil assured Malaysians not to worry about the debris as most would be destroyed in Earth's atmosphere during re-entry.
"Debris that is not fully incinerated in the atmosphere will land on earth," he said.
Azlikamil said it was unlikely for the space debris to land on Malaysia, as the country covered a relatively small area on the surface of Earth.
"The probability of this object hitting humans or destroying any building structures is very low, since 70% of Earth is made up of water and Malaysia is small.
"Additionally, the exact location of re-entry cannot be predicted accurately," he said, adding that MySA would announce any developments.
Azlikamil advised the public not to touch or collect any objects from the re-entry incident and call the emergency hotline at 999 if they come across it.
He also urged members of the public to take videos of the incident to assist any investigations if there is one and not to spread false information about the re-entry phenomenon.
In May last year, debris from another of China's Long March rockets fell on villages in the Ivory Coast, causing structural damage but fortunately no injuries or deaths were reported.
KUALA LUMPUR: Orang ramai tidak perlu bimbang terhadap laporan sebuah roket milik China dikenali sebagai Long March 5B dijangka terhempas ke bumi hujung minggu ini.
Ia berikutan kebarangkalian objek itu menimpa manusia atau merosakkan struktur bangunan adalah sangat rendah.
Menurut Agensi Angkasa Malaysia (MYSA), jangkaan itu berdasarkan 70 peratus daripada permukaan bumi adalah air, selain keluasan Malaysia kecil berbanding keluasan muka bumi.
Katanya, lokasi sebenar roket berkenaan dijangka terhempas atau 're-entry' tidak dapat diramal dengan tepat dan pihak MYSA akan memaklumkan perkembangan dari semasa ke semasa.
"Ramalan terkini bahawa 're-entry' roket Long March 5B akan jatuh ke bumi adalah pada 7 Mei jam 9.34 pagi hingga 3.34 petang waktu Malaysia.
"Sisa roket masih mengorbit dan semakin menurun menghampiri zon 're-entry'," kata kenyataan MYSA, hari ini.
MYSA menjelaskan, setiap pelancaran roket kebiasaannya akan meninggalkan serpihan bergantung kepada saiz roket yang dilancarkan.
Memandangkan saiz Long March 5B agak besar, katanya, serpihan yang berkemungkinan terhempas ke bumi juga besar.
Bagaimanapun, MYSA berkata, sebahagian besar serpihan itu akan musnah terbakar di atmosfera dan berkecai menjadi serpihan kecil, selain hanya serpihan yang tidak terbakar sepenuhnya akan jatuh ke bumi.
Sehubungan itu, MYSA menasihati orang ramai supaya tidak menyentuh atau mengambil sebarang objek mencurigakan atau menyedut wap yang dikeluarkan daripada serpihan disyaki daripada kejadian roket terhempas itu.
MYSA juga menasihati orang ramai menghubungi talian kecemasan 999 atau MYSA di talian 03-26972570 serta membuat laporan sewajarnya jika menyaksikan kejadian berkenaan dan merakamkannya bagi membantu siasatan, selain tidak menyebarkan sebarang maklumat palsu.
Tambah MYSA, Long March 5B bukan objek terbesar memasuki ruang atmosfera bumi, sebaliknya rekod sebelum ini membabitkan stesen angkasa Mir milik Russia dengan muatan 120,000 kilogram (kg) pada 23 Mac 2001.
"Sebagai perbandingan, berat sisa roket Long March 5B dijangka dalam 21,000 kg dan hanya 1/5 daripada berat stesen angkasa Mir," katanya.
Roket Long March 5B dilancarkan pada 29 April lalu untuk menghantar modul teras stesen angkasa China iaitu Tianhe dengan berat 22,600 kg ke orbit pengoperasian di angkasa. – BERNAMA
lagi satu kan, apa yg i suka masyarakat dan komuniti saintifik di negara maju and people who love science depa akan ambik kesempatan ni untuk
a) menerangkan kosep fizik - macam momentum, tenaga kinetik , tenaga keupayaan, depa terangkan how to understand the trajectory , tengok altitude etcb) they really pay attention to this ...and somehow boleh fikir macam mane nak manfaatkan insiden ni untuk tujuan proses pembelajaran
i mean yes IT IS PART of SCIENTIFIC EDUCATION
kita?
kita dok bising stduens tak minat sains tapi what do we do ?
kita tahu kita kitak perlu panic tAPI NAMPAK it is a matter of curiousity.bukan UNTUK BIMBANG...no...just it is interesting to see physics in action
tapi yes lah bebena macamni tak lah se sensasi yups somehow.
betapa uniknya parameters alam tabi'i ciptaan ALLAH SWT ni berinteraksi u know...
u see that 's why i suka liputan negara maju sebab they have the manpower and they have the people who ARE GENUINELY interested in science ...
Post time 6-5-2021 06:35 PM
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