Meteorite find may be missing half of interstellar collision

first_img Journal information: Earth and Planetary Science Letters Citation: Meteorite find may be ‘missing half’ of interstellar collision (2014, July 1) retrieved 18 August 2019 from https://phys.org/news/2014-07-meteorite-interstellar-collision.html For several years scientists have debated the reason behind a lull, then sudden resurgence of biodiversity on planet Earth a little over 500 million years ago—some suggest the resurgence was due to a sudden major increase in the number of meteorite impacts. The increase, theorists suggest, came about due to an impact between two asteroids, likely somewhere between Jupiter and Mars. Debris from the remains of one of those objects is believed to be the source of L chondrites, which have been found in many places around the globe. But, until now, no evidence of the other asteroid has been found on Earth, putting a damper on the theory—some have suggested the second asteroid simply vaporized on impact. The meteorite found in Sweden has reignited interest, however, because it’s possible it is a piece of that second asteroid (because it appears to have been part of the same meteor shower as the L chondrites), which if true, will add a lot of credence to the entire theory that seeks to explain the sudden resurgence of life during the early part of the Ordovician period.The meteorite was found by quarry workers three years ago—other meteorites have been found in the same quarry before, but all of them were L chondrites. It was different from the other’s, the researchers noted, after studying its crystals, but was in the same rock layer and dating in the lab, suggesting it arrived during the same time period as part of a wider meteor shower. While still in the same class of primitive achondrites as L chondrites, it’s not exactly the same because of small differences in its elemental composition. The team is hopeful that the finding suggests that others will be found, hopefully some that can offer more evidence of their origin.The unique meteorite has not been given an official name yet—for now it’s simply being referred to as the “mysterious object.” The Thorsberg quarry and the Mysterious Object. (A) Thorsberg quarry on June 15, 2013. The Österplana church is seen in the back. (B) The Mysterious Object from the Glaskarten 3 bed. The meteorite is 8 × 6.5 × 2 cm in size. It was found in the youngest quarried bed of the Thorsberg quarry, at the top of the section. Credit: Earth and Planetary Science Letters, Volume 400, 15 August 2014, Pages 145–152. Explore further Research shows collision created Chelyabinsk asteroidcenter_img (Phys.org) —A team of researchers with members from the U.S., Sweden and Switzerland studying a meteorite found in a Swedish quarry is reporting that the rock is unlike anything else ever found. In their paper published in Earth and Planetary Science Letters, they suggest the meteorite might just be evidence of a collision between two asteroids millions of years ago. 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. More information: A fossil winonaite-like meteorite in Ordovician limestone: A piece of the impactor that broke up the L-chondrite parent body? Earth and Planetary Science Letters, Volume 400, 15 August 2014, Pages 145–152. www.sciencedirect.com/science/ … ii/S0012821X14003367AbstractAbout a quarter of all meteorites falling on Earth today originate from the breakup of the L-chondrite parent body ∼470 Ma ago, the largest documented breakup in the asteroid belt in the past ∼3 Ga. A window into the flux of meteorites to Earth shortly after this event comes from the recovery of about 100 fossil L chondrites (1–21 cm in diameter) in a quarry of mid-Ordovician limestone in southern Sweden. Here we report on the first non-L-chondritic meteorite from the quarry, an 8 cm large winonaite-related meteorite of a type not known among present-day meteorite falls and finds. The noble gas data for relict spinels recovered from the meteorite show that it may be a remnant of the body that hit and broke up the L-chondrite parent body, creating one of the major asteroid families in the asteroid belt. After two decades of systematic recovery of fossil meteorites and relict extraterrestrial spinel grains from marine limestone, it appears that the meteorite flux to Earth in the mid-Ordovician was very different from that of today. © 2014 Phys.orglast_img read more

Up for some wisecracks

first_imgA media graduate, a soon-to-be lawyer and an ex-IT guy chartered different ways to eventually come together in what-they-call a closely knit English stand up community of India.  Gursimran Khamba, Sundeep Rao and Akshay Bd talk to Millennium Post about their brand of humour ahead of a performance in Delhi.  Gursimran, popularly known as Khamba, is the serious guy out of this lot. Serious? Comedy? You think that’s an oxymoron? Well, in Khamba’s case, it works and also, ruffles a few feathers. Also Read – ‘Playing Jojo was emotionally exhausting’ Khamba is a political satirist who takes digs at current affairs, politics and religion. Starting his career as a blogger in Delhi, he became an online sensation with his quirky takes on significant issues. His popularity made him known amongst English stand up comedians who were building a niche for their brand of comedy back in 2008-2009 in Delhi. When asked about the evolution of English stand up comedy in his view, he says, ‘Unlike  earlier, now you have a comedy calendar in metro cities. Like the independent music and film scene, comedy has taken an independent form over these years.’  Also Read – Leslie doing new comedy special with NetflixWith a post graduation degree in media and a successful career in stand-up comedy, what lies ahead for Khamba? Would the next big move be television? And pat comes the reply, ‘No!’ . He adds,’ I would like to stick to the internet. I have a podcast, All India Bakchod, up and running. We get to do extensive interviews with stand up comics like Raju Srivastav. Internet offers a lot of freedom that TV cannot. ‘Another blogger-cum-performer from Bengaluru, Sundeep Rao started his career in stand up comedy a year ago. With his undeniable comic aura he leapfrogged to Ash Chandler’s Ministry of Schtick in Mumbai in no time. Talking about his brand of humour, he says, ‘ I studied sociology in college. It reflects through my acts. Urban comedy with a witty take on human behaviour and society is what I usually do.’  Talking about a recent controversy, wherein a comedy channel was banned in India for 10 days, he says, ‘What’s the point of free speech? Anyway, I am sensitive towards the issues I pick up. I know there’s no funny way to talk about rapes and other social issues in society.’Next on our list is Akshaye Bd, a Brahmin from Bengaluru, studying last year of Law in Delhi.  Being Brahmin from Bengaluru itself is a subject for stand up comedy for Akshaye. He elaborates, ‘Our society overemphasizes the role of academic degrees in life. That leads to a lot of frustration.’ His anger finds an outlet in comedy. For him, it is a platform that keeps him satisfied because he gets to say things everybody thinks of but no one talks about.The three of them are grateful to Geliophobics Entertainment that keeps on organising more and more performances in the capital. With two to three performances every weekend, the trio believes that Delhi makes for a great avenue for stand up comedy in India.last_img read more

Your Virtual Operator Is Standing by

first_imgAugust 21, 2009 Opinions expressed by Entrepreneur contributors are their own. Free Webinar | Sept 5: Tips and Tools for Making Progress Toward Important Goals Attend this free webinar and learn how you can maximize efficiency while getting the most critical things done right. When you started your first business, who answered the phones? Was it you? Your mother? That nice guy you hired for his baritone pipes, until he billed thousands of dollars in “inappropriate” charges to your fledgling firm?It probably didn’t take long to realize that you need to immediately make a strong, professional impression for your clients to take you seriously. You want them to make contact and imagine a corporate army at the end of the line, even if your troops consist of just a dedicated three or four.The solution for more and more small businesses is voice over IP, or VoIP–the shorthand for phone systems that run through the Internet rather than over traditional telephone networks.VoIP companies often specifically target small businesses, offering full business telephone services–from automated voice answering to conferencing–without having to buy a $50,000 piece of communications hardware the size of your garage beer fridge. Aptela is one example: All you need is a broadband connection–T-1, cable modem or DSL will do. Aptela doesn’t even require you to buy specific phones, though the company does recommend Polycom softphones.Service plans that include unlimited calling start at $29.99 per month, but the Herndon, Va., company also offers a 250-minute business calling plan or a metered usage plan. The price can be 40 percent to 60 percent cheaper than comparable service from a telephone company.”Most small companies want to know, ‘How can I look bigger and have the appearance of a Fortune 500 company?'” says Larry Barker, president and CEO of Aptela. The company’s auto attendant service provides automated phone answering and routing functions with voice talent and scripting customized for your business.The auto attendant not only asks who is calling, but also announces the caller after the connection is made. (Who said the age of heraldry had come and gone?)Other key features include conferencing, integrating with Outlook and routing calls to mobile phones, which comes in mighty handy for a small company.”You can be in different cities or at a vacation home or a hotel, and no one knows,” Barker says. These are the kinds of features that can help make a start-up company seem like it’s been in business forever.Peter Norton, the owner and managing partner of Sanford Rose, an executive recruiting firm, says his experience with the auto attendant feature has been good so far.”We feel like it gives us a competitive advantage because we’re always on the phone,” he says, “but we need to be available and know who’s calling.”That point isn’t lost on Steve Roberson, the co-founder and technical lead of Start-Up Hire, a new job site for venture capital-backed companies.”It makes your company seem more polished–like it has a cohesive presence, even if everyone is spread out,” Roberson says. As Roberson puts it, it’s like that old New Yorker cartoon: “On the Internet, nobody knows you’re a dog.” 3 min read Register Now »last_img read more

How to Protect Remote Employees PCs from Security Threats

first_img 4 min read July 27, 2010 No matter the size of your business, technology has blurred the boundaries of the traditional work space location and has made remote working a reality for many employees.The attitude toward employees working “away from the office” has changed dramatically. A lot of businesses are recognizing the productivity, cost savings and morale benefits to giving their employees more location flexibility. Unfortunately, a remote staff poses different risks from employees who spend the majority of their time in the office, and compromised data can end up costing business owners a lot more than they would be saving by allowing their employees to work remotely.Security-conscious companies typically invest in protection at their gateway or entrance to their network. Usually it’s an appliance or software, which provides not only firewall protection, but also web and e-mail filtering. This is can be the right decision for companies wanting to prevent threats before they can reach the internal networks, but for businesses with employees working remotely it can get a bit trickier. This is because once employees are outside of the company’s network, they fall outside the gateway security perimeter and are on their own.Here are some of the issues that can occur with employees working remotely–and what do to about them:Less protection equals more vulnerabilityGateway security technologies are not able to provide protection if a computer is not connected to the network. Once out of the network (at a home, coffee shop or library), a computer is essentially relying on whatever software security installed on the PC to protect itself.Solution: Be sure the employees’ notebooks are updated with the most recent software updates. If there is no  VPN  (a private, secured network that will allow employees to connect to the office from anywhere) connection, then confirm that updates can download directly from the internet. Also, check whether your security solution includes a location-awareness feature. This feature will automatically increase security levels based on the location of the device. The better ones will automatically increase security levels when the PC is out off the office and away from the internal network.Employees surfing the webUnless the URL filtering solution is operating on each client PC, employees are free to connect to any website they want. Because more than 90 percent of threats now come from the web and more than half of all employees will view websites unrelated to their work during office hours, this is a concern both for security and productivity reasons.Solution: When possible, connect the employee back to the office using the VPN. This will allow the PC to benefit from gateway security technologies. If VPN is not available, URL filtering on the employees’ PC provides an added layer of security outside the office.Carelessly connecting to wireless networksSometimes the urge to connect to the internet surpasses security concerns. A fake access point, also known as an “Evil Twin,” is a rogue Wi-Fi access point that appears to be legitimate. However, it is actually set up by cybercriminals to eavesdrop on wireless communications.Solution:  You can avoid Evil Twins, by staying away from unconfirmed wireless hotspots, and by sticking to secure sites that are verified by companies such as  TRUSTe .If this is too difficult to control, consider installing a security solution that checks the safety of wireless networks. This way you don’t have to think twice when you’re relocating your office to the newest tea house in town. As a small-business owner, the world is your office, especially with all the technology available to you. That technology is also a great way to save money and increase productivity, but without the proper precautions in place, it can also cost you dearly. A little security goes a long way, so make sure your data doesn’t fall into the wrong hands when you–or your employees–take your business on the road.For more information and to stay updated on the latest threats, check out sites like  Wired Safety ,  Connect Safely  or  Center for Internet Security . Growing a business sometimes requires thinking outside the box. Free Webinar | Sept. 9: The Entrepreneur’s Playbook for Going Global Opinions expressed by Entrepreneur contributors are their own. Register Now »last_img read more