Asteroid expert says surveillance is key to survival, planning is key to defense (Phys.org) —A team of researchers with members from Colorado State University, the University of Wisconsin and NOAA has found that several satellites orbiting the Earth at the time of the Chelyabinsk meteor explosion captured the debris trail on film. As the team explains in their paper published in Proceedings of the National Academy of Sciences, the captured images allowed for calculating the trajectory of the meteor and then its orbit. Citation: Scientists discover satellites captured Chelyabinsk meteor debris trail (2013, October 22) retrieved 18 August 2019 from https://phys.org/news/2013-10-scientists-satellites-captured-chelyabinsk-meteor.html This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. © 2013 Phys.org The Chelyabinsk explosion that occurred in the stratosphere over Russia this past February was a stark reminder of the dangers posed by meteors—the resulting shock wave injured over 1000 people and caused damage across the region. Because of their relatively small size, modern science has still not been able to come up with a way to see such meteors before they strike the earth. The Chelyabinsk meteor was a complete surprise—no one knew of its existence until it exploded. For that reason, scientists continue to look for new tools to help with forecasting. In this new effort, the researchers wondered if American weather satellites had captured the strike and if so, if they might provide any new information.After studying imagery from multiple satellites, the team discovered that several of them had indeed captured images of the debris trail, some just moments after the meteor exploded. Analyzing the images allowed for calculating the trajectory of the meteor and from that, its prior orbit. Scientist’s had already done the same using photographs taken by people in Russia, of course, but because the calculations matched so closely, the researchers were able to confirm that images of satellites can be used to provide accurate data about meteor events that are not recorded in other ways.Calculating trajectories and orbits is important because it’s believed that up to 15 percent of meteors travel in pairs, or even as triplets. If scientists can very quickly calculate the trajectory of a strike, they can look to see if more are coming, possibly saving lives. Also, if meteor detection is built into satellites in the future, they could conceivably report on the actual number and locations of strikes around the world—as things stand now it’s possible that relatively small meteors strike fairly regularly in remote locations or in the ocean and nobody knows its happening. Photograph of meteor trail near Chelyabinsk, Russia on 15 February 2013 at about 9:21 AM local time, with corresponding DMSP satellite image from about 9:25 AM. Credit: Photograph courtesy of Alex Alishevskikh (blog.cyberborean.org/2013/02/16/meteor), satellite image courtesy of Steven D. Miller, Colorado State University. More information: Earth-viewing satellite perspectives on the Chelyabinsk meteor event, PNAS, Published online before print October 21, 2013, DOI: 10.1073/pnas.1307965110AbstractLarge meteors (or superbolides [Ceplecha Z, et al. (1999) Meteoroids 1998:37–54]), although rare in recorded history, give sobering testimony to civilization’s inherent vulnerability. A not-so-subtle reminder came on the morning of February 15, 2013, when a large meteoroid hurtled into the Earth’s atmosphere, forming a superbolide near the city of Chelyabinsnk, Russia, ∼1,500 km east of Moscow, Russia [Ivanova MA, et al. (2013) Abstracts of the 76th Annual Meeting of the Meteoritical Society, 5366]. The object exploded in the stratosphere, and the ensuing shock wave blasted the city of Chelyabinsk, damaging structures and injuring hundreds. Details of trajectory are important for determining its specific source, the likelihood of future events, and potential mitigation measures. Earth-viewing environmental satellites can assist in these assessments. Here we examine satellite observations of the Chelyabinsk superbolide debris trail, collected within minutes of its entry. Estimates of trajectory are derived from differential views of the significantly parallax-displaced [e.g., Hasler AF (1981) Bull Am Meteor Soc 52:194–212] debris trail. The 282.7 ± 2.3° azimuth of trajectory, 18.5 ± 3.8° slope to the horizontal, and 17.7 ± 0.5 km/s velocity derived from these satellites agree well with parameters inferred from the wealth of surface-based photographs and amateur videos. More importantly, the results demonstrate the general ability of Earth-viewing satellites to provide valuable insight on trajectory reconstruction in the more likely scenario of sparse or nonexistent surface observations. Journal information: Proceedings of the National Academy of Sciences Explore further
Cataglyphis savignyi. Credit: AntWeb/ Creative Commons Attribution License, Photographer: Ryan Perry A team of researchers at Université Libre de Bruxelles in Belgium has found that desert ants (Cataglyphis savignyi) have a means for binding their spermatozoa into bundles that, by working together as a team, are able to swim faster than individual sperm cells. In their paper published in the journal Biology Letters, the researchers describe how in studying the ant’s sperm under a microscope they were able to identify bundles formed of 50 to 90 sperm cells, forming what appears to look like an octopus with a huge number of appendages. Citation: Researchers find bundled team swimming in ant spermatozoa increases speed (2014, June 11) retrieved 18 August 2019 from https://phys.org/news/2014-06-bundled-team-ant-spermatozoa.html More information: Paper: Team swimming in ant spermatozoa, rsbl.royalsocietypublishing.or … .1098/rsbl.2014.0308 © 2014 Phys.org Sperm cells compete in a never-ending race Female desert ants mate promiscuously, that is, they mate with one male after another in quick succession, building up a load of sperm which they then use to fertilize their eggs. While this approach might seem logical to the females, it clearly is cause for problems for the males, each of which are genetically programmed to do their best to pass on their genes. Even more problematic is that the males die shortly after mating, which means, they only get one shot at making sure it’s their sperm that is selected by the female. As a result, the team in Belgium reports, the desert ant has developed a means for speeding up the rush to the queen’s spermatheca—having its sperm cells band together to swim together as a single unit. To help the swimmers stay together and work as a team, their heads are all “glued” together with a cap of sticky protein, creating the impression of a single headed creature with a mass of tails swimming frantically forward.The researchers found that such bundles could swim up to 51 percent faster than individual sperm cells, which in theory should mean more of an individual’s sperm ends up in the female’s spermatheca. The problem of course is that all the other males are using the same technique. Perhaps in the future, the ants will develop a means for adding water squeezed propulsion to the bundles to add even more speed, ala octopi and squid. In the meantime, it appears that with ants the best bundler will be the one that prevails. Journal information: Biology Letters Explore further This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
Citation: Best of Last Week–First ‘image’ of dark matter web, why shoes come untied and a link between brain structure and anxiety (2017, April 17) retrieved 18 August 2019 from https://phys.org/news/2017-04-weekfirst-image-dark-web-untied.html This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. Explore further
Wrapped in fog in day time and wearing a sombre look, Coronation Park, the birthplace of New Delhi was plunged into darkness by sundown on Sunday, the only irony being the day coinciding with the Capital city’s 104th anniversary.The historic ground had hosted one of the grandest imperial Durbar ever in 1911, where King George V and Queen Mary were coronated as the Emperor and Empress of India and the British capital was officially shifted from Calcutta to Delhi. Also Read – Man arrested for making hoax call at IGI airportLocal residents oblivious to the importance of the place, let alone the day, wandered about in the park, while graffiti scrawled up on the iconic Coronation Pillar, that marks the site of the Durbar, only added to the overwhelming irony.“Is December 12 a historic day for Delhi? I don’t know. I was born in the vicinity and have seen this place from my childhood days. We used to play cricket here, and now come here on and off. But, I don’t know what this place is, whose those statues are of and December 12’s importance,” said 17-year-old Aditya Jha, when enquired about the place. Also Read – Disqualified AAP MLA Kapil Mishra, women’s wing chief join BJPThe historic land falling under the DDA, was taken up by Sheila Dikshit regime to be redeveloped as a ‘Coronation Park’, and work was to be completed by 2011, to coincide with New Delhi’s 100th anniversary.But, DDA has been missing several deadlines since then and on Saturday, it added just another to that list.As per the plans, the whole area has been redesigned keeping the Coronation Pillar as nodal point. A majestic statue of King George V, which once adorned the canopy opposite the India Gate stands amid four other statues (of Indian viceroys) placed at the four corners around the obelisk. Masons can be still seen working on several sections, and heaps of earth being piled up at the second entrance gate, while the ticket counter at the main gate is far from ready.“The whole area plunges into darkness after sunset, as the new lampposts, barring a few, have malfunctioned. We have lodged a complaint with the authorities, but they have not been restored yet,” a security guard of the park said.“But, more than the unfinished work, it is the public nuisance caused by young couples at the park which is causing discomfort to local people, especially elders, who now prefer to avoid the place,” he said.All statues except that of Lord Chelsford dissolved into darkness by evening. King George’s iconic statue adorned with his Durbar robe too disappeared after the sunset. Lord Chelmsford’s statue stood there lit up by two bright spotlights, in abject contrast to the darkness around it.INTACH Delhi Convener A G K Menon said, “It was a sad commentary that DDA can’t look after its own asset.” “The bureaucratic inertia that has delayed the project so far, and it continued this year too. The funds to carry forward the project has stopped, the willingness has stopped…I am sad about this whole state of affairs now,” Menon said.Indian National Trust for Art and Cultural Heritage has been chosen by the DDA as a consultant for the ambitious project, but continuous delay has dampened its spirit.
In an initiative to bring the finest works of some renowned artists to an art lover’s disposal, a new group paintings exhibition titled ‘Creative Six’ is being held at the Creativity Art Gallery in the national Capital. The exhibition which began on January 25 will be on till February 15. It features the works of extremely talented artists – Farhad Hussain, Gegorge Martin PJ, Kishore Roy, Krishnendu Poral, Jagmohan Bangani and Tejinder Kanda, will include relief prints, dry pints, collographs and lithographs. Also Read – ‘Playing Jojo was emotionally exhausting’What happens when you bring six creative minds under the same roof? It is a potpourri of colours, emotions and imagination. Six artists are showcasing their works which are carefully handpicked. The personalities, who are being associated with ‘Creativity Art Gallery’, touch different subjects that will connect with the art lovers. Visual treats are by Tejinder Kanda whose strong strokes come together to form song and dance or depict a scene from around your everyday surroundings. Shekhar Jhamb, director, Creativity Art Gallery expressed his motto very aptly. He said: “The aim of the gallery is not only to bring forward good artists but artists who think differently. We want to imprint these artists in the minds of the masses and help ignite aspiring artists as well. When that happens, I’ll feel I’m on the right track”.WHERE: Creativity Art GalleryWHEN: January 25 to February 15TIME: 11 am to 7 pm
Kolkata: Murshidabad district administration has taken up a unique initiative to increase the income of the farmers, thereby giving them an opportunity to be economically stronger.The district administration has started buying paddy directly from the farmers. The farmers have started selling their produce at various rice mills designated by the district administration. The initiative has created a platform to ensure that the paddy farmers get better price. Also Read – Rain batters Kolkata, cripples normal lifeSenior administrative officials of the district have already held a meeting to spread awareness among the paddy cultivators, about the move made by the state government. The district administration has set a target of buying more paddy this year. It has been learnt that various women involved with the self-help groups in the district would be deployed for the buying and selling of paddy. The administration has been engaging women from various self-help groups at every block of the district. The officials have already held meetings with the rice mill owners, urging them to buy paddy directly from the farmers. The district administration will also keep a tab on the entire exercise. The farmers involved in paddy cultivation throughout the district have been informed to sell their produce directly to the government. A control room will be thrown open soon to disseminate information among the farmers. A rice mill has also been constructed at Berhampore through the initiatives of the district administration, where a huge amount of paddy can be stored. Earlier, the farmers had to sell their produce for lower cost due to scarcity of go-downs in the district. All the mill owners have been asked to buy paddy from the farmers, at a rate that has been fixed by the government.
Plants are essential when it comes to decorating a small balcony. Avoid using too much floor space of your balcony, do not overcrowd it, says an expert.Below are some smart ideas to have a small outdoor paradise that is full of life.Plants are essential things you’ll need to have to decorate a small balcony. Hang potted plants behind the railings and on the walls.Avoid using too much floor space of your balcony, do not overcrowd it. Instead, devise ways to utilise vertical space to double up your space. It’s the best space savvy solution that will allow you to have more plants in your limited space. Also Read – Add new books to your shelfEast-facing balcony receives almost six hours of sun, often between 8 am and 1 pm, and the major benefit of having such a balcony is that you can save your plants from the harsh afternoon sun.West-facing balcony garden is quite similar to south-facing balcony – here the sun shines at its peak for about six-to-eight hours and except tender shade-loving plants, you can plant almost anything.Themed plant and flower garden are also viral these days. People living in apartments and penthouses prefer to indulge themselves in kitchen gardening and low-space gardening with small pots and planters in their balcony area. Small coloured pots with different shapes and sizes are in trend. Also Read – Over 2 hours screen time daily will make your kids impulsiveOne can also place vines and planters in bottles too. Like growing creeper plants like money plant in a bottle will surely use less space and will also enhance the aura of your balcony. Waste bottles of soft drinks can be decorated and painted as per the colour scheme of your interior and can be used to grow such plants.Growing flowers of bright shades and exotic fragrance will surely attract butterflies to your flowerbeds. It will ultimately lead you to defining a budget-friendly butterfly garden in your balcony making it a centre of attraction.