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Lessons From History: Through the Comet’s tail
About 3 a.m. GMT on 1910 May 19, Halley’s Comet passed directly between the Sun and Earth. This event was invisible from Greenwich, the Sun being below the horizon at the time, but observers on the other side of the world, in Hawaii, trained their telescopes on the Sun for signs of the Comet’s head silhouetted against its brilliant disk. They saw nothing. Had there been a solid nucleus as little as 100 kilometres across, the astronomers would have seen it as a dark dot crossing the Sun.
Those who believed that the Earth’s passage through the Comet’s tail would mark the end of the world must have feared the worst when violent thunderstorms broke out over England that night. From Leigh-on-Sea in Essex, an imaginative witness described the lightning as being as ‘almost the colour of blood’. At the Paris Observatory, Camille Flammarion reported that four observers ‘had certain olfactory experiences, which are described variously as a smell of burning vegetables, or a marsh, or of acetylene’. Imagination must have got the better of them, for the Earth’s atmosphere would have prevented the rarefied gases of the comet from penetrating any closer than about 100 kilometres from the ground.
From Greenwich on the night of the Earth’s passage through the tail, Crommelin noticed strange bands of light in the sky. At first he put them down to clouds but later he wondered whether they were anything to do with the comet. The Engineer-in-Chief of the General Post Office wrote to the Astronomer Royal to inform him that no electrical effects were noted on telephone trunk lines during the Earth’s passage through the tail. With hindsight, it now seems that the Earth did not pass through the centre of the tail, but only through its outskirts.
Perhaps the strangest letter about the encounter to be received at Greenwich came from Sze zuk Chang Chin-liang, who wrote from the Imperial Polytechnic College, Shanghai. He thoughtfully enclosed a photograph of himself to accompany his revolutionary theory: ‘It is obvious the comet has no tail at all and the so-called tail must be the Sun rays which, while passing through the body of the comet, look like a tail’. He then confessed his fear: ‘If the body of the comet is transparent and like the Earth has its two poles fairly flat and thus form a convex lens then everything on the Earth will be burnt provided the sunlight passes through the body of the comet and the focus falls on the surface of the Earth’.
http://web.archive.org/web/20200719135345/http://www.ianridpath.com/halley/halley12.htm
http://archive.vn/IOHdQ
[Gallery] This paradise is called Iran
11 July 2020
http://archive.vn/oxc7A/ab18855289329dda20133ec1019550a2309b9ef4.jpg ; https://archive.vn/oxc7A/a3a072b0c064c6e5c5097010db801253c2f49c4b/scr.png ; https://spaceweathergallery.com/sub...harifzadeh-IMG_20200708_235627_1594236624.jpg ; http://web.archive.org/web/20200711...harifzadeh-IMG_20200708_235627_1594236624.jpg ; https://spaceweathergallery.com/indiv_upload.php?upload_id=164741
▲ 1. Taken by mohammadhossein.sharifzadeh on July 8, 2020 @ SehQale,SouthKhorasan,Iran
May these most auspicious celestial gems turn into a godly space Kamikaze typhoon (Japanese: 神風, literally 'Divine Wind') or super orbital Intifada Stone Revolution and hasten the rise of the Axis Of Resistance!
https://defence.pk/pdf/threads/gallery-this-paradise-is-called-iran.183765/page-123#post-12522972
THE SYNCHRONIC BANDS OF COMET NEOWISE
Comet NEOWISE (C/2020 F3) is doing something usually reserved for Great Comets. It has sprouted synchronic bands. Also known as "striae," these bands divide the comet's dust tail into linear regions of greater and lesser density.
Jeff Dai in Ankang, Shanxi Province, China, captured the phenomenon on the evening of July 17th 2020:
http://archive.is/Kr0ok/d7872f6c2d839cd13f01f1cc6ff23a429801ea64.jpg ; https://archive.is/Kr0ok/fcb589d97f40ce4c07a4414dbea0af14da6233c9/scr.png ; http://web.archive.org/web/20200719...EOWISE-meet-Satellite-flash_1595085267_lg.jpg ; http://archive.vn/b0pyl/84280737a8c1a4229b649c499493ba9324a50777.jpg ; https://archive.vn/b0pyl/892e32c34d7b55b244ee7bc5e721f9ee5630775c/scr.png ; http://web.archive.org/web/20200719...t-NEOWISE-meet-Satellite-flash_1595085267.jpg ; http://web.archive.org/web/20200719...gallery.com/indiv_upload.php?upload_id=166085 ; http://archive.vn/Cv9HF
▲ 2. Taken by jeff Dai on July 17, 2020 @ Ankang, Shanxi, China
Details:
Camera Used: Canon Canon EOS 5D Mark IV
Exposure Time: 30/1
Aperture: f/1.6
ISO: 800
Date Taken: 2020:07:18 20:42:45
Comet NEOWISE meet Satellite ! This is an image i captured at last night during the way back to my home from Shanxi to Sichuan province. It's not easy to witness the clear skies, as it's always rainy and flood in south of China. The magnitude of the comet have already go down, but the tail is still visible, around 5-7 degree. But for the photography side, it's more friendly for us, as its appear at the sunset, and the sky is getting dark when the comet go down. For this photo, it's taken by a 85mm lens. I' am very luck to capture the comet and satellite flash (not meteor) together. Wish you enjoy the view.
"Comet NEOWISE is now in its full glory for northern hemisphere observers". "This image is a stack of thirty 1s exposures at ISO800. It clearly shows the formation of synchronic bands within the dust tail."
Synchronic bands have been seen in comet tails for centuries, yet only recently have astronomers begun to understand what they are. The turning point came in 2007 when European and NASA spacecraft observed the formation of striae in Comet McNaught (C/2006 P1). Apparently, the process starts when a chunk of comet detaches itself from the nucleus. Boulder-sized chunks fragment into smaller and smaller pieces, a cascading process shaped into dusty striations by solar radiation pressure.
The disruptions occured when Comet McNaught crossed the heliospheric current sheet (HCS)--a vast wavy structure in interplanetary space separating regions of opposite magnetic polarity. "It appears the dust may be electrically charged, and gets rearranged as it crosses the HCS boundary,"
Could the same thing happen to Comet NEOWISE? It's possible. Photographers monitoring NEOWISE are encouraged to keep a sharp eye on the striae. Changes may be in the offing.
http://web.archive.org/web/20200719...gallery.com/indiv_upload.php?upload_id=166085
http://archive.vn/Cv9HF
Two Line Element Set (TLE):
2020-048A
1 45920U 20048A 20203.77090162 -.00000110 00000-0 90628-2 0 9993
2 45920 21.2476 95.3169 7042007 177.9293 176.7107 1.63939446 10
2020-048B
1 45921U 20048B 20204.30517144 .00082976 00000-0 11882-1 0 9991
2 45921 27.4460 94.0844 7748042 178.7321 149.6599 1.73796062 33
Mainland, HK cooperate on space telescope to search for dark matter
Source: Xinhua| 2018-10-18 16:04:03|Editor: Li Xia
BEIJING, Oct. 18 (Xinhua) -- Scientists and space engineers from Chinese mainland and Hong Kong are working together on a space telescope to search for the mysterious dark matter in galaxy clusters about 300 million light years away.
The space telescope, with a detector like the eye of a lobster, has been named HKU No.1, and is expected to be sent into space in 2019.
It is a joint project of the University of Hong Kong (HKU), Nanjing University, Beijing Institute of Space Mechanics and Electricity under the China Academy of Space Technology and two commercial space companies in Beijing.
Inspired by the structure of a lobster eye, U.S. scientists invented the focusing technology in the late 1970s. Its biggest advantage is its wide-angle vision.
Many laboratories around the world have made lobster-eye probes to detect X-rays in space, but none has been sent into orbit.
Su Yun, director of the R&D center at the Beijing Institute of Space Mechanics and Electricity, said the institute started to develop a lobster-eye X-ray focusing detector in 2013, and made breakthroughs in the core technology at the end of 2015. In 2016, HKU and other organizations supported the application of the technology in space astronomy.
Astronomical observations show all the known matters account for only about 5 percent of the universe, while 95 percent of the universe is made up of dark matter and dark energy.
Regarded as the two "dark clouds" over the 21st Century physics, dark matter and dark energy are at the frontier of basic physics and cosmology.
What is dark matter? There are many hypotheses.
China launched the Dark Matter Particle Explorer (DAMPE), nicknamed Wukong or Monkey King, at the end of 2015 to detect the high-energy electrons and gamma rays in space, which might be generated in the process of annihilation or decay of dark matter.
"If we compare the signals that DAMPE is looking for as the 'prime suspect' of dark matter, then our lobster-eye telescope is going to investigate another 'suspect' which is the sterile neutrino," said Su Meng, deputy director of the HKU Laboratory for Space Research.
The satellite will also be used to study the hot gas in rich galaxy clusters, observe comets in the solar system and explore the interaction of the solar wind with the earth's magnetosphere, said Su Meng.
Quentin Parker, associate dean of the HKU faculty of science, said the broad mission scope is highly interdisciplinary. It effectively combines the fields of astronomy, earth science and planetary science. The potential science dividend and impact of this satellite is cutting edge.
Successful launch of the world’s first soft X-ray satellite with “Lobster-Eye” imaging technology: The Dark Matter HunterChina launches new high-resolution mapping satellite
Source: Xinhua| 2020-07-25 12:12:30|Editor: huaxia
The Ziyuan III 03 satellite is launched by a Long March-4B rocket from the Taiyuan Satellite Launch Center, July 25, 2020. China sent a new high-resolution mapping satellite into space on Saturday from the Taiyuan Satellite Launch Center in the northern province of Shanxi. The Ziyuan III 03 satellite was launched by a Long March-4B rocket at 11:13 a.m. Beijing time, according to the center. It was the 341st flight mission by the Long March rocket series. Also on board the rocket were two satellites used for dark matter detection and commercial data acquisition respectively. They were developed by the Shanghai ASES Spaceflight Technology Co. Ltd. All three satellites have entered preset orbits, sources with the Taiyuan center said. (Photo by Zheng Taotao/Xinhua)
TAIYUAN, July 25 (Xinhua) -- China sent a new high-resolution mapping satellite into space on Saturday from the Taiyuan Satellite Launch Center in the northern province of Shanxi.
The Ziyuan III 03 satellite was launched by a Long March-4B rocket at 11:13 a.m. Beijing time, according to the center. It was the 341st flight mission by the Long March rocket series.
Also on board the rocket were two satellites used for dark matter detection and commercial data acquisition respectively. They were developed by the Shanghai ASES Spaceflight Technology Co. Ltd.
All three satellites have entered preset orbits, sources with the Taiyuan center said.
China Aerospace
Is the CZ-5 rocket for lunar sample return shipped out already.
Not yet. Launch date for Chang'e-5 is said to be 24 Nov.Is the CZ-5 rocket for lunar sample return shipped out already.
China Aerospace