Comet Surface Wild and Crazy

first_img“Completely unexpected,” was the reaction of Donald Brownlee, principal investigator of the Stardust mission, to the photos revealed by the spacecraft that flew into the tail of Comet Wild-2 last January (see 01/02/2004 headline), reports a University of Washington press release.  The comet mission is the cover story in the June 18 issue of Science, with four scientific papers and two reviews.  Photos and information have also been released at the Jet Propulsion Laboratory Stardust website.    Scientists expected to find a dirty, fluffy snowball of loose material, but found instead a surface unlike anything else in the solar system.  Deep flat-floored pits, craters with steep walls and pinnacles more than three hundred feet high indicate that the comet material is rigid and cohesive enough, despite the low gravity, to hold together under impacts.  Planetary scientists thought that most comets were like rubble piles loosely held together by gravity, easily torn apart by gravitational perturbations.  Maybe some are, but the sharp edges, angular shapes and steep cliffs on Wild-2 make it look brittle and very unlike an asteroid, and different than the previously-visited comets Halley and Borrelly.  Perhaps there is more variety among comets than expected.    The comet jets on Wild-2 (pronounced vilt-2), also unexpectedly, emerge at high velocity from numerous places around the roughly circular body, rather than being sublimated off the outer surface volatiles.  Some of them appear to be collimated like the jets from a fire hose, suggesting that they emerge from pits deep in the interior.  Stardust was hit with two wallops as high-velocity dust particles from particularly strong jets pummeled its shields at hundreds of kilometers per hour on the way through the dust tail.  The spacecraft succeeded admirably, despite the hazards, in taking pictures and collecting dust particles in its aerogel collector for return to earth.    Delighted, but perplexed, describes the mood of scientists over the mission so far.  “New in situ observations of a comet are demonstrating once again how little we understand about these dark and mysterious planetesimals,” remarked Harold Weaver in Science.1  Brownlee et al.2 claim that the surface reveals a “juxtaposition of features that are young and old” on an object thought to be a primordial relic of the formation of the solar system.  Hinting that these findings are putting theories in turmoil, an editorial in the same issue3 hopes that the return of the particles in January 2006 will “clear up any nightmares about the origin of the solar system and the dynamics of comets.”1Harold A. Weaver, “Not a Rubble Pile?” Science, Vol 304, Issue 5678, 1760-1762, 18 June 2004 [DOI: 10.1126/science.1100581].2Brownlee et al., “Surface of Young Jupiter Family Comet 81P/Wild 2: View from the Stardust Spacecraft,” Science, Vol 304, Issue 5678, 1764-1769, 18 June 2004 [DOI: 10.1126/science.1097899].3“Sweet Dreams Are Made of These,” Science, Vol 304, Issue 5678, 1760, 18 June 2004 [DOI: 10.1126/science.304.5678.1760a].Everyone should be thrilled at the success of this mission of discovery, but it does point out a lesson about scientists.  Since scientists know so little about things they can observe, and since they often find contradictions to their expectations, why should we trust any confident-sounding pronouncements about things they can’t observe?  When they talk about this comet having formed billions of years ago, how can they possibly know that?    Brownlee’s paper says, “Pinnacles were not anticipated land forms on primitive bodies, and their origin on Wild 2 is a mystery.”  He thinks the jets, pinnacles and impact craters are young, but the rest of the comet is old, only because current theories require the solar system to be 4.6 billion years old, and comets had to form near the beginning.  But then how does he keep the comet from dissipating away completely long ago?  (See 03/27/2003 headline.)  He tells an ad hoc story to get the theory to fit the observations.  He claims Wild-2 may have repeatedly come inside Jupiter’s orbit and back out again.  But then how did the comet escape complete break-up by a collision in the planetary shooting gallery, or avoid getting ejected out of the solar system entirely, during one of those excursions?    The nightmares may not go away entirely in January 2006.  If history is any guide, the comet dust samples will answer some questions but raise many others.  For a sweet dream, however, imagine yourself standing on the surface of the three-mile wide comet.  The gravity is so low, you could jump and launch yourself into orbit.  Cool.(Visited 9 times, 1 visits today)FacebookTwitterPinterestSave分享0last_img read more

Unverferth announces Buyer’s Bucks reward program

first_imgShare Facebook Twitter Google + LinkedIn Pinterest Unverferth Manufacturing Co., Inc., announces the Buyer’s Bucks reward program for purchasers of its brands of new grain carts from July 1, 2015 through Dec. 31, 2015.  Purchasers of Brent, Killbros, Parker and Unverferth grain carts during this time period will earn up to $3,000 in Buyer’s Bucks toward future purchases of select Unverferth-manufactured brands of products including high-capacity grain wagons, sprayers, seed tenders, header transports and Rolling Harrow, Ripper-Stripper, Ripper Roller, Zone-Builder and Ripper-Bedder tillage products.The Buyer’s Bucks coupon amounts are $3,000 for 1,500- through 2,000-bushel capacity carts, $2,000 for 1,100- to 1,300-bushel capacity carts and $1,000 for carts with 500-1,000+ bushel capacity.  Registered purchasers will automatically receive a Buyer’s Bucks coupon good in the appropriate amount. The coupon can be redeemed on future purchases of a wide range of products from July 1, 2015 through Dec. 31, 2016, and will be deducted from the dealer and buyer established price on a future purchase. Complete details are available at the nearest grain cart dealer or by visiting Unverferth.com.last_img read more

ReadWriteWeb Events Guide, March 5 2011

first_imgReadWrite Sponsors Tags:#Events Guide#web 8 Best WordPress Hosting Solutions on the Market We’re always on the lookout for upcoming Web tech events from around world. Know of something taking place that should appear here? Want to get your event included in the calendar? Let us know in the comments below or email us. Related Posts center_img Top Reasons to Go With Managed WordPress Hosting Why Tech Companies Need Simpler Terms of Servic… A Web Developer’s New Best Friend is the AI Wai…last_img read more

Krishnan Madasamy and Subrata Pal: Caught in Indian sport’s vicious circle

first_imgKrishnan MadasamyA fallen athlete is a lonely one. Who remembers Subrata Pal today? Tomorrow, who will remember Krishnan Madasamy? Both lifters, separated by 12 years, were stripped of Commonwealth Games medals and their stories run parallel, a sign how little changes in Indian sport.Kolkata-based Pal, 38 today, who tested positive,Krishnan MadasamyA fallen athlete is a lonely one. Who remembers Subrata Pal today? Tomorrow, who will remember Krishnan Madasamy? Both lifters, separated by 12 years, were stripped of Commonwealth Games medals and their stories run parallel, a sign how little changes in Indian sport.Kolkata-based Pal, 38 today, who tested positive after winning silver in Auckland in 1990, lives quietly, working for Eastern Railways. Madasamy, whose tainted Games silver came in Manchester this year, shares a one-room home with a friend and is a painter at the Integral Coach Factory in Perambur near Chennai.Two evenings after winning his medal in 1990, all Pal was told by officials was that he had to return home from Auckland. He was banned for two years and to this day maintains he was never told what “substance” he was banned for.”If we get into trouble, our coaches just desert us.” Subrata Pal, 1990 Commonwealth Games weightlifterMadasamy, who tested positive for a nandrolone derivative and could face a two-year ban, says he consumed only vitamins and creatine and cleared a dope test in March and was tested again between April and July.When he tested positive in Manchester, he said he volunteered to undergo a blood test. “But Games officials told me it cost too much. Lifting was my passion but I just don’t feel like doing anything anymore.”Pal claims his coach Pal Singh Sandhu kept track of and gave him all the medication he ever took. “He did not trust anyone else with it.” After his test, Pal said he found Sandhu unwilling to help. “If we win a medal, they’re always around to share the limelight,” he says. “But if we get into trouble, they just desert us.”advertisementPal and Madasamy have been caught in Indian sport’s vicious circle – Sandhu is still coach of the national weightlifting team.last_img read more

Shooting victim to be airlifted older man stabbed in face in Provo

first_img Recommended for you Facebook Twitter Google+LinkedInPinterestWhatsAppProvidenciales, 02 Jun 2015 – An update on that shooting reveals the man shot outside his home on Aquamarine Street in Millennium Heights subdivision in Wheeland will be airlifted today for further medical care, he was last listed in critical condition. The man, described as a Bahamian is believed to have been followed by his attackers who fired several shots at him in a drive by attempt, likely on his life. The man managed to duck into his home, but not before being struck and it is unclear how many times at this point. It was said the police could be looking for a silver colored vehicle. We are also receiving a report of a stabbing; a 65 year old Jamaican man, long-time resident of these islands had emergency surgery as he too was listed in critical condition after being attacked as he was walking; our report is that he was stabbed about the body, even in the face. We have no news on where the incident happened or how many assailants there were at this time, but we can tell you that he was robbed. The man will also be transferred out of country for further treatment. Facebook Twitter Google+LinkedInPinterestWhatsApp Police involved shooting in Lewis Yard, details scant Manhunt on for Kim’s Crescent killer, Bahamas police report two other shootings TCI Police Investigate shooting in Providenciales; two escape injury Related Items:millenium heights, shooting, wheelandlast_img read more

HBOs chief the force behind Game of Thrones to step down

first_imgHBO chief executive Richard Plepler, here with Big Little Lies stars Nicole Kidman and Reese Witherspoon, oversaw HBO’s rise as an awards juggernaut.  Getty Images Richard Plepler, the longtime head of HBO who ushered the network to newfound critical and popular dominance with hits like Game of Thrones, is stepping down.  Plepler, whose departure was announced Thursday, oversaw HBO’s rise to dominate television awards ceremonies and audience ratings, most recently with blockbuster, critically praised hits like Game of Thrones. He also spearheaded HBO as one of the pioneers in TVs transition to direct-to-consumer streaming subscriptions. HBO was one of the first traditional networks to make its programming available online to people who subscribed directly with its app, rather than requiring a regular pay-TV subscription. The announcement comes the same week a court decision lifted the final question marks holding back AT&T from exerting its full control over HBO. AT&T agreed to take over HBO’s parent, Time Warner, more than two years ago in an $85 billion deal. But the Department of Justice took the companies to court, hoping to block the merger and, later, appealing to potentially unwind it. The US government lost its appeal Tuesday.”Hard as it is to think about leaving the company I love, and the people I love in it, it is the right time for me to do so,” Plepler said in a memo to employees. John Stankey, a veteran AT&T executive who was appointed to lead WarnerMedia last year (becoming Plepler’s boss), called him “one of the most successful executives in our industry.””I have been fortunate to have his support over the last months,” Stankey said in statement.  Share your voice 0 Tags Post a comment TV and Movies Digital Media Time Warner Game of Thrones HBO AT&T Netflixlast_img read more

Fashion designer Digraj Singh Shahpura loves promoting Indian heritage and culture

first_imgDigraj Singh ShahpuraPR HandoutDigraj Singh Shahpura, a popular Indian fashion designer who belongs to the royal clan of Shahpura has been instrumental in promoting Indian heritage and culture through his exclusively designed ethnic apparel.He is also known for doing some exclusive and innovative work in the field of hospitality. His work is diversified and is not only a fashion designer but also has business dealing with hotels, jewelry and interior designs.Digraj has made a mark with his classic tailored cut Indian wear, not just here but in and abroad as well. Digraj has collaborated and done trunk shows with prestigious fashion houses in abroad and India like Burberry, Berluti, Tods and Dior.Digraj gathered a lot of knowledge in the world of fashion by staying and travelling abroad. Thereafter he planned to start his own brand by the name of “Digraj Singh Shahpura” in 2015 and has not looked back since then.And he is dedicated towards bringing a new revolution in Indian fashion and putting it on to the international fashion map by bringing out designs that reflect his Rajasthani roots – Jodhpuri, Bandhgala, Achkan, which are his strengths.Furthermore, his designs bring across an aesthetic and regal tapestry of the fineries of Rajasthan that reflect the heritage and craft of the Indian state.Digraj Singh Shahpura is known for resurrecting fashion styles of the bygone era. His designs have made clothing patterns iconic and fashionable besides keeping intact the rich heritage of Rajasthan.last_img read more

Reliance Jio Airtel in race for Anil Ambanis RCom assets

first_imgMukesh Ambani’s Reliance Jio and Bharti Airtel are among the top contenders for the assets of the bankrupt Reliance Communications, Reliance Telecom and Reliance Infratel. Major asset management companies and telecom tower operators are also eyeing the assets and have submitted their expressions of interest (Eols) to compete with the telecom giants.The Economic times reported that about 12 companies have sent their expressions of interest to buy the RCom assets. However, Vodafone Idea was not in the list of suitors. As per the report, Deloitte will manage the bankruptcy process of RCom.RCom’s assets such as 14 broadcasting airwaves, 43,000 telecom towers housed under Reliance Infratel and some fiber and real estate assets are listed for sale. RCom will lose a major part of its present revenue after the license for 800 MHz 4G spectrums expires in 2021.The Anil Ambani-led telecom company has been in news for the long-standing debt of about Rs 46,000 crore. ET reported that the company owes money to 39 financial creditors. The company and its units also have hundreds of operational creditors.Airtel is eyeing RCom’s assets in view of upcoming 5G plans after acquiring the airwaves. The company had faced a setback following the success of Jio, and is looking to revive its market share by buying RCom’s airwaves.However, with private equity firms seeking deals in the sector, the battle for the asset acquisition might get intense. Their interest would mostly lie on the assets rather than spectrum, which increases the competition between the telecom giants.According to the latest reports, a consortium led by Canada’s Brookfield Asset Management was in talks to buy Reliance Industries’ Reliance Jio Infratel unit in a multi-stage deal.last_img read more

Dhaka Beijing sign 9 instruments

first_imgChinese Commerce Minister Zhong Shan (R) shakes hands with a Bangladeshi delegate as Bangladesh`s prime minister Sheikh Hasina (back-L) and Chinese Premier Li Keqiang applaud during a signing ceremony at the Great Hall of the People in Beijing on 4 July 2019. Photo: AFPBangladesh and China on Thursday signed nine instruments for further strengthening cooperation on power, water resources, culture and tourism sectors as well as providing 2,500 metric tonnes of rice for the displaced Rohingyas.The instruments, including two loan deals, were signed in presence of Bangladesh prime minister Sheikh Hasina and Chinese Premier Li Keqiang after a bilateral meeting between the two leaders at the Great Hall of the People in Beijing, the capital of China.Of the instruments, four ones were signed between the Economic Relations Division of Bangladesh and the Ministry of Commerce of China, foreign secretary Md Shahidul Haque told reporters.The four instruments are Framework Agreement of Expansion and Strengthening of Power System Network under DPDC Area; Framework Agreement of Power Grid Network Strengthening Project under PGCB Project; Agreement on Economic and Technical Cooperation between the two governments; and Memorandum of Understanding on the Establishment of Investment Cooperation Working Group.The ERD also inked two loan agreements with the Export-Import Bank of China.Bangladeshi prime minister Sheikh Hasina (R) and Chinese premier Li Keqiang attend a welcome ceremony outside the Great Hall of the People in Beijing, China, on 4 July 2019. Photo: ReutersThe two agreements are Government Concessional Loan Agreement of Expansion and Strengthening of Power System Network under DPDC Area Project; and Preferential Buyer’s Credit Loan Agreement of Expansion and Strengthening of Power System Network under DPDC Area Project.Besides, a Memorandum of Understanding (MoU) and its Implementation Plan upon provision of Hydrological Information of Yaluzhangbu/Brahmaputra River was signed between Ministry of Water Resources of Bangladesh and Ministry of Water Resources of China.Bangladesh`s prime minister Sheikh Hasina and China`s Premier Li Keqiang talk during a signing ceremony at the Great Hall of the People in Beijing, China on 4 July 2019. Photo: ReutersAnother MoU on Cultural and Tourism Exchange Programme was signed by Ministry of Culture of China and Ministry of Cultural Affairs of Bangladesh.The remaining instrument is Letter of Exchange (LOE) on the Rohingya Refugees Rice Aid, which was signed the Disaster Management and Relief Ministry of Bangladesh and China International Development Cooperation Agency (CIDCA).Under the LoE, China will provide 2,500 metric tonnes of rice as assistance for the displaced Rohingya people who have taken shelter in Bangladesh.On behalf of Bangladesh side, ERD Secretary Monwar Ahmed signed most of the instruments, while Water Resources Secretary Kabir bin Anwar and Cultural Affairs Secretary Dr Md Abu Jena Mostafa Kamal inked one instrument each.last_img

DU students continue demo for cancelling ties with 7 colleges

first_imgDU students continue demo for cancelling ties with 7 colleges. Photo: UNBA group of Dhaka University students put academic and administrative buildings under lock and key for the third consecutive day on Tuesday demanding an end to the university’s affiliation with seven colleges, reports UNB.The students boycotted classes and exams and locked the main entrances of Registrar, Arts, Curzon Hall, Mokarram Bhaban, Law Faculty and Business Faculty, Institute of Modern Languages, Institute of Education and Research, and Social Science buildings around 8:00am.”Our message is clear — we won’t return to classes until the university administration gives us any written assurance to cancel the affiliation of the colleges,” said Shakil Mia, one of the leaders of the demonstrators.He said the protest will continue until their demands are met.Contacted, DU proctor professor AKM Golam Rabbani said to UNB, “We requested the striking students to return to classes and sit with the university administration to resolve any problem. But they rejected our proposal.”The affiliated colleges are Dhaka College, Eden Mohila College, Government Shaheed Suhrawardy College, Kabi Nazrul Government College, Begum Badrunnesa Government Women’s College, Mirpur Government Bangla College and Government Titumir College.Meanwhile, Dhaka University Central Students’ Union (DUCSU) on Monday expressed its solidarity with the students’ demand and called upon the protesting students to go back to classes, saying it will take effective measures after discussions with the university administration and education ministry after vice-chancellor Md Akhtaruzzaman returns from China.last_img read more