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Asteroid Impact Prediction
Asteroid impact prediction is the prediction of the dates and times of asteroids impacting Earth, along with the locations and severities of the impacts. The process of impact prediction follows three major steps: # Discovery of an asteroid and initial assessment of its orbit which is generally based on a short observation arc of less than 2 weeks. # Follow up observations to improve the orbit determination # Calculating if, when and where the orbit may intersect with Earth at some point in the future. In addition, although not strictly part of the prediction process, once an impact has been predicted, an appropriate response needs to be made. Most asteroids are discovered by a camera on a telescope with a wide field of view. Image differencing software compares a recent image with earlier ones of the same part of the sky, detecting objects that have moved, brightened, or appeared. Those systems usually obtain a few observations per night, which can be linked up into a very pre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Asteroid Close Approaches To Earth
This is a list of examples where an asteroid or meteoroid travels close to the Earth. Some are regarded as potentially hazardous objects if they are estimated to be large enough to cause regional devastation. Near-Earth object detection technology began to improve around 1998, so objects being detected as of 2004 could have been missed only a decade earlier due to a lack of dedicated near-Earth astronomical surveys. As sky surveys improve, smaller and smaller asteroids are regularly being discovered. The small near-Earth asteroids , 2014 AA, 2018 LA, 2019 MO and 2022 EB5 are the only five asteroids discovered before impacting into Earth (see asteroid impact prediction). Scientists estimate that several dozen asteroids in the size range fly by Earth at a distance closer than the moon every year, but only a fraction of these are actually detected. Timeline of approaches within one lunar distance The average distance to the Moon (or lunar distance (LD)) is about , which is ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earth-crossing Asteroid
An Earth-crosser is a near-Earth asteroid whose orbit crosses that of Earth as observed from the ecliptic pole of Earth's orbit. The known numbered Earth-crossers are listed here. Those Earth-crossers whose semi-major axes are smaller than Earth's are Aten asteroids; the remaining ones are Apollo asteroids. ''(See also the Amor asteroids.)'' An asteroid with an Earth-crossing orbit is not necessarily in danger of colliding with Earth. The orbit of an Earth-crossing asteroid may not even intersect with that of Earth. This apparent contradiction arises because many asteroids have highly inclined orbits, so although they may have a perihelion less than that of Earth, their paths can never cross. An asteroid for which there is some possibility of a collision with Earth at a future date and which is above a certain size is classified as a potentially hazardous asteroid (PHA). Specifically, an asteroid is a PHA if its Earth minimum orbital intersection distance (MOID) is <0.05 [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NARA
The National Archives and Records Administration (NARA) is an " independent federal agency of the United States government within the executive branch", charged with the preservation and documentation of government and historical records. It is also tasked with increasing public access to those documents which make up the National Archive. NARA is officially responsible for maintaining and publishing the legally authentic and authoritative copies of acts of Congress, presidential directives, and federal regulations. NARA also transmits votes of the Electoral College to Congress. It also examines Electoral College and Constitutional amendment ratification documents for prima facie legal sufficiency and an authenticating signature. The National Archives, and its publicly exhibited Charters of Freedom, which include the original United States Declaration of Independence, United States Constitution, United States Bill of Rights, and many other historical documents, is headquart ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Science And Technology Council
The National Science and Technology Council (NSTC) is a council in the Executive Branch of the United States. It is designed to coordinate science and technology policy across the branches of federal government. History The National Science and Technology Council (NSTC) was established by President Bill Clinton through Executive Orderbr>12881on November 23, 1993. Each presidential administration has utilized the NSTC in varying fashions. During the Clinton administration, the NSTC wrote 6 Presidential Review Directives, used for President Clinton's own future directives. The council has not issued any of these since. Instead, the council's recommendations often serve as advice for other committees as policy is drafted. Members of the science and technology community have debated whether the NSTC should play a more direct role in policymaking by issuing formal directives and having increased authority. The structure of the NSTC has changed multiple times in the last few decades. U ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The New York Times
''The New York Times'' (''the Times'', ''NYT'', or the Gray Lady) is a daily newspaper based in New York City with a worldwide readership reported in 2020 to comprise a declining 840,000 paid print subscribers, and a growing 6 million paid digital subscribers. It also is a producer of popular podcasts such as '' The Daily''. Founded in 1851 by Henry Jarvis Raymond and George Jones, it was initially published by Raymond, Jones & Company. The ''Times'' has won 132 Pulitzer Prizes, the most of any newspaper, and has long been regarded as a national " newspaper of record". For print it is ranked 18th in the world by circulation and 3rd in the U.S. The paper is owned by the New York Times Company, which is publicly traded. It has been governed by the Sulzberger family since 1896, through a dual-class share structure after its shares became publicly traded. A. G. Sulzberger, the paper's publisher and the company's chairman, is the fifth generation of the family to head the pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quartz (publication)
''Quartz'' is an online news platform in English. It is focused on international business news. Quartz is privately held and was established in New York City in 2012. It is published in the United States with global business news and has specific publications for Africa, Hong Kong, India, Japan, and the United Arab Emirates. Audience and revenue ''Quartz'' targets high-earning readers, calling itself a "digitally native news outlet for business people in the new global economy". Sixty percent of its readers access the site via mobile devices. In August 2017, ''Quartz''s website saw about 22 million unique visitors. Approximately 700,000 people subscribe to its roster of email newsletters, which includes its flagship ''Daily Brief''. According to ''Ad Age'', ''Quartz'' made around $30 million in revenue in 2016, and employed 175 people. In 2017, revenue decreased to $27.6 million as advertising shrank. Uzabase (Japanese: ユーザベース) purchased the organization for $8 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Washington Post
''The Washington Post'' (also known as the ''Post'' and, informally, ''WaPo'') is an American daily newspaper published in Washington, D.C. It is the most widely circulated newspaper within the Washington metropolitan area and has a large national audience. Daily broadsheet editions are printed for D.C., Maryland, and Virginia. The ''Post'' was founded in 1877. In its early years, it went through several owners and struggled both financially and editorially. Financier Eugene Meyer purchased it out of bankruptcy in 1933 and revived its health and reputation, work continued by his successors Katharine and Phil Graham (Meyer's daughter and son-in-law), who bought out several rival publications. The ''Post'' 1971 printing of the Pentagon Papers helped spur opposition to the Vietnam War. Subsequently, in the best-known episode in the newspaper's history, reporters Bob Woodward and Carl Bernstein led the American press's investigation into what became known as the Watergate scandal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brief Answers To The Big Questions (book)
''Brief Answers to the Big Questions'' is a popular science book written by physicist Stephen Hawking, and published by Hodder & Stoughton (hardcover) and Bantam Books (paperback) on 16 October 2018. The book examines some of the universe greatest mysteries, and promotes the view that science is very important in helping to solve problems on planet Earth. The publisher describes the book as "a selection of awking'smost profound, accessible, and timely reflections from his personal archive", and is based on, according to a book reviewer, "half a million or so words" from his essays, lectures and keynote speeches. The book was incomplete at the time of the author's passing in March 2018, but was completed with "his academic colleagues, his family and the Stephen Hawking Estate". The book includes a foreword written by Eddie Redmayne, who won an Academy Award for his portrayal of Hawking in the 2014 film ''The Theory of Everything''; an introduction by Nobel Prize-winning phy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Physicist
A physicist is a scientist who specializes in the field of physics, which encompasses the interactions of matter and energy at all length and time scales in the physical universe. Physicists generally are interested in the root or ultimate causes of phenomena, and usually frame their understanding in mathematical terms. Physicists work across a wide range of research fields, spanning all length scales: from sub-atomic and particle physics, through biological physics, to cosmological length scales encompassing the universe as a whole. The field generally includes two types of physicists: experimental physicists who specialize in the observation of natural phenomena and the development and analysis of experiments, and theoretical physicists who specialize in mathematical modeling of physical systems to rationalize, explain and predict natural phenomena. Physicists can apply their knowledge towards solving practical problems or to developing new technologies (also known as applie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inquisitr
Inquisitr, a website started in 2007 for news and entertainment stories, was relaunched in May 2011. It is owned and operated by Inquisitr Ltd. History The web domain for Inquisitr was registered in Iceland on August 6, 2007. The company was founded by former TechCrunch journalist Duncan Riley, whose history of launching web businesses includes ''the Blog Herald'', launched in 2002. In 2004, he launched the blog network ''Weblog Empire'', which in 2005, served as the base site for ''b5media LLC'', of which Riley was a co-founder. The company went on to earn $15 million in profits before eventually being sold at a loss. Riley left the company with an undisclosed settlement after protesting the poor pay of its employees. Inquisitr was eventually put up for sale in 2011, with Riley citing personal reasons for the sale. The current website owner, Daniel Treisman, purchased the website via Flippa.com and invested into growing the company. Growth In an interview with AdExchanger the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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