Sunday, December 9, 2012

Beyond 2012: Why the World Won't End


Beyond 2012: Why the World Won't End
11.13.12
 
Google +Beyond 2012: Google+ Hangout with NASA
Dec. 21, 2012, won't be the end of the world as we know, however, it will be another winter solstice.

Contrary to some of the common beliefs out there, the claims behind the end of the world quickly unravel when pinned down to the 2012 timeline.

Below, NASA Scientists answer questions on the following 2012 topics:


Blue Marble - High-Res Image of the Earth› View larger
A 'Blue Marble' image of the Earth taken from the Visible/Infrared Imager Radiometer Suite (VIIRS) instrument aboard NASA's Suomi NPP satellite. This composite image uses a number of swaths of the Earth's surface taken on January 4, 2012. Credit: NASA/NOAA/GSFC/Suomi NPP/VIIRS/Norman Kuring

Question (Q): Are there any threats to the Earth in 2012? Many Internet websites say the world will end in December 2012.
 Answer (A):The world will not end in 2012. Our planet has been getting along just fine for more than 4 billion years, and credible scientists worldwide know of no threat associated with 2012.


Q: What is the origin of the prediction that the world will end in 2012?
 A: The story started with claims that Nibiru, a supposed planet discovered by the Sumerians, is headed toward Earth. This catastrophe was initially predicted for May 2003, but when nothing happened the doomsday date was moved forward to December 2012 and linked to the end of one of the cycles in the ancient Mayan calendar at the winter solstice in 2012 -- hence the predicted doomsday date of December 21, 2012.


Q: Does the Mayan calendar end in December 2012?
 A: Just as the calendar you have on your kitchen wall does not cease to exist after December 31, the Mayan calendar does not cease to exist on December 21, 2012. This date is the end of the Mayan long-count period but then -- just as your calendar begins again on January 1 -- another long-count period begins for the Mayan calendar.


Q: Is NASA predicting a "total blackout" of Earth on Dec. 23 to Dec. 25?
 A: Absolutely not. Neither NASA nor any other scientific organization is predicting such a blackout. The false reports on this issue claim that some sort of "alignment of the Universe" will cause a blackout. There is no such alignment (see next question). Some versions of this rumor cite an emergency preparedness message from NASA Administrator Charles Bolden. This is simply a message encouraging people to be prepared for emergencies, recorded as part of a wider government preparedness campaign. It never mentions a blackout.
›Watch the Video


Q: Could planets align in a way that impacts Earth?
 A: There are no planetary alignments in the next few decades and even if these alignments were to occur, their effects on the Earth would be negligible. One major alignment occurred in 1962, for example, and two others happened during 1982 and 2000. Each December the Earth and sun align with the approximate center of the Milky Way Galaxy but that is an annual event of no consequence.
› More about alignment

"There apparently is a great deal of interest in celestial bodies, and their locations and trajectories at the end of the calendar year 2012. Now, I for one love a good book or movie as much as the next guy. But the stuff flying around through cyberspace, TV and the movies is not based on science. There is even a fake NASA news release out there..."
- Don Yeomans, NASA senior research scientist

Q: Is there a planet or brown dwarf called Nibiru or Planet X or Eris that is approaching the Earth and threatening our planet with widespread destruction?
 A: Nibiru and other stories about wayward planets are an Internet hoax. There is no factual basis for these claims. If Nibiru or Planet X were real and headed for an encounter with the Earth in 2012, astronomers would have been tracking it for at least the past decade, and it would be visible by now to the naked eye. Obviously, it does not exist. Eris is real, but it is a dwarf planet similar to Pluto that will remain in the outer solar system; the closest it can come to Earth is about 4 billion miles.


Q: What is the polar shift theory? Is it true that the Earth's crust does a 180-degree rotation around the core in a matter of days if not hours?
 A: A reversal in the rotation of Earth is impossible. There are slow movements of the continents (for example Antarctica was near the equator hundreds of millions of years ago), but that is irrelevant to claims of reversal of the rotational poles. However, many of the disaster websites pull a bait-and-switch to fool people. They claim a relationship between the rotation and the magnetic polarity of Earth, which does change irregularly, with a magnetic reversal taking place every 400,000 years on average. As far as we know, such a magnetic reversal doesn’t cause any harm to life on Earth. Scientists believe a magnetic reversal is very unlikely to happen in the next few millennia.
› More about polar shift


Q: Is the Earth in danger of being hit by a meteor in 2012?
 A: The Earth has always been subject to impacts by comets and asteroids, although big hits are very rare. The last big impact was 65 million years ago, and that led to the extinction of the dinosaurs. Today NASA astronomers are carrying out a survey called the Spaceguard Survey to find any large near-Earth asteroids long before they hit. We have already determined that there are no threatening asteroids as large as the one that killed the dinosaurs. All this work is done openly with the discoveries posted every day on the NASA Near-Earth Object Program Office website, so you can see for yourself that nothing is predicted to hit in 2012.


Q: How do NASA scientists feel about claims of the world ending in 2012?
 A: For any claims of disaster or dramatic changes in 2012, where is the science? Where is the evidence? There is none, and for all the fictional assertions, whether they are made in books, movies, documentaries or over the Internet, we cannot change that simple fact. There is no credible evidence for any of the assertions made in support of unusual events taking place in December 2012.
› Why you need not fear a supernova
› About super volcanoes


Q: Is there a danger from giant solar storms predicted for 2012?
 A: Solar activity has a regular cycle, with peaks approximately every 11 years. Near these activity peaks, solar flares can cause some interruption of satellite communications, although engineers are learning how to build electronics that are protected against most solar storms. But there is no special risk associated with 2012. The next solar maximum will occur in the 2012-2014 time frame and is predicted to be an average solar cycle, no different than previous cycles throughout history.
› Video: Solar Storms
› More about solar storms

Monday, January 2, 2012

AC and DC power

What Is AC Power?
AC stands for alternating current, which is an electrical current that frequently reverses direction. AC electricity is measured according to its cycles, with one complete cycle being counted each time a given current travels in one direction and then doubles back on itself. An electrical current is able to complete many cycles per second, and is then given its frequency rating based on that number; for example, the typical frequency in North America is 60 hertz (Hz), which indicates that the current is performing 60 cycles per second. AC power is the type of electricity most commonly used in homes and offices, and is extremely versatile because its voltage can be changed through a transformer to suit a variety of transmission needs.

What Is DC Power?
DC is the abbreviation for direct current, which is a type of electrical current that travels through a circuit in only one direction. Direct current is the type of electrical power that is produced by fuel cells, batteries, and generators equipped with commutators. While DC power was the first type of electricity to be commercially transmitted, it has been widely replaced by alternating current (AC) electricity, and is now used primarily in electrochemical and metal-plating applications.

Monday, December 26, 2011

Overseas Pakistani Population

Statistics

Continent / CountryArticlesOverseas Pakistani Population
Asia
74,391
 Hong KongPakistanis in Hong Kong20,000[9][dead link]
 JapanPakistanis in Japan12,500[10]
 MalaysiaPakistanis in Malaysia10,000, expected to increase to 100,000 by end of 2010[11]
 South KoreaPakistanis in South Korea7,000
 ThailandPakistanis in Thailand1,980
 SingaporePakistanis in Singapore1,600
 Philippines
1,000
 ChinaPakistanis in China653
 Kazakhstan
500
 BruneiPakistanis in Brunei300[12]-500
 IndonesiaPakistanis in Indonesia400
 Sri LankaPakistanis in Sri Lanka369
 KyrgyzstanPakistanis in Kyrgyzstan1500[13][dead link]
 BangladeshPakistanis in Bangladesh310
 Turkmenistan
243
 Azerbaijan
200
 Maldives
100
 Uzbekistan
75
 Myanmar
51
 Nepal
46
 Tajikistan
30
 Vietnam
25
 Mongolia
15[14]
Europe
2,200,000[1]
 United KingdomBritish Pakistanis,
Pakistanis in London
1,200,000[1]
England: 1,100,000 (2010)[15]
Scotland: 90,000 (2010)[16]
Wales: 9,000 (2010)[17]
Northern Ireland: 1000 (2010)[18]
 ItalyPakistanis in Italy100,000[1]
 GreecePakistanis in Greece80,000[1]
 FrancePakistanis in France60,000[1]
 SpainPakistanis in Spain47,000[1]
 NetherlandsPakistanis in the Netherlands40,000[1]
 NorwayPakistani Norwegians36,400[19]
 GermanyPakistanis in Germany35,081[20]-52,668(2005)[21]
 DenmarkPakistanis in Denmark31,000[1][22]
 BelgiumPakistanis in Belgium14,500
 TurkeyPakistanis in Turkey2,000
 IrelandPakistanis in Ireland5,000
 Portugal
6,000
 SwedenPakistani Swedish5,250
 AustriaPakistanis in Austria3,500
 SwitzerlandPakistanis in Switzerland2,415
 UkrainePakistanis in Ukraine1,612
 RussiaPakistanis in Russia1,500
 Cyprus
1,100
 Romania
710
 Finland
525
 Poland
180
 Hungary
45
 Bosnia and Herzegovina
16
 Bulgaria
16
 Moldova
10
 Serbia
2
 Croatia
1
Others
1620
Americas
851,385
 United StatesPakistani American210,245[23]
 CanadaPakistani Canadian90,000[24] - 124,730
 CubaPakistani Cuban1000[25]
 Peru
250
 Chile
200
 Brazil
180
 Mexico
150
 Bolivia
50
 Argentina
30
 Paraguay
12
 Colombia
10
 Suriname
3
Africa
37,964
 LibyaPakistanis in Libya30,000
 South AfricaPakistanis in South Africa2,500
 Kenya
1,862
 Tanzania
950
 EgyptPakistanis in Egypt700 (2011)[26][27]
 Zimbabwe
400
 Nigeria
292
 Sudan
200
 Botswana
160
 Ghana
152
 Niger
62
 Mauritius
43
 Morocco
38
 Algeria
34
 Djibouti
30
 Senegal
26
 Comoros
11
 Madagascar
11
 Seychelles
5
Others
773
Oceania
25,000
 AustraliaPakistani Australian20,000[28]
 New ZealandPakistani New Zealander5,000[29]
Middle EastPakistanis in the Middle East1,893,373
 Saudi ArabiaPakistanis in Saudi Arabia1,100,000
 United Arab EmiratesPakistanis in the United Arab Emirates1,200,000
 KuwaitPakistanis in Kuwait100,000
 OmanPakistanis in Oman85,000
 QatarPakistanis in Qatar52,000
 BahrainPakistanis in Bahrain45,000
 IranPakistanis in Iran11,500
 JordanPakistanis in Jordan8,000-10,000[30]
 IsraelPakistanis in Israel1,000
 LebanonPakistanis in Lebanon700[31]
 YemenPakistanis in Yemen700
 SyriaPakistanis in Syria600-700[30]
 IraqPakistanis in Iraq456
 Palestine
10
Others
500
Total Overseas Pakistani Population
7,000,000+[3]