BEIJING -- After one year of trial operation, China's Five-hundred-meter Aperture Spherical Radio Telescope (FAST), the world's largest single-dish radio telescope, has identified multiple pulsars, the National Astronomical Observatories of China (NAOC) said Tuesday. It was the first time a radio telescope independently developed by Chinese scientists has found pulsars. Two of the pulsars, named J1859-01 and J1931-01, are 16,000 light years and 4,100 light years from Earth with rotation periods of 1.83 seconds and 0.59 seconds, respectively. According to Li Di, chief scientist at the radio astronomy division of the NAOC, the two pulsars were discovered on Aug 22 and 25 when FAST was drift-scanning the southern galactic plane. The discovery was later confirmed by the Parkes radio telescope in Australia in September. Li said FAST has already detected dozens of promising pulsar candidates, six of which had been confirmed by international organizations. Peng Bo, deputy director of the FAST project, said three to five years of trial operation is usually required for a radio telescope as large and complicated as FAST. "It is truly encouraging to have achieved such results within just one year," said Peng. Located in a naturally deep and round karst depression in southwest China's Guizhou Province, FAST was completed in September 2016. Its receiving area is equivalent to about 30 football fields. Astronomers are able to use FAST to survey hydrogen in the Milky Way and other galaxies, detect thousands of new pulsars and study the origin and evolution of the universe. Over 2,700 pulsars have been identified since the first one was discovered by British astronomers Jocelyn Bell Burnell and Antony Hewish on Nov 28, 1967. But almost all of them are within the scope of the Milky Way. Many scientists expect FAST to be the first telescope to capture a pulsar outside the galaxy. Technical preparations have been made for FAST to search for pulsars outside the Milky Way as early as next year. FAST is believed to be the world's most sensitive radio telescope. Engineers have said it is so sensitive it could capture the signal of a cell phone being used on the moon. Before the completion of the Square Kilometer Array (SKA) telescope, funded by a consortium of countries, FAST will remain the global leader for the next 10 to 20 years. The telescope is expected to discover twice the number of pulsars currently known and it is highly likely to make breakthroughs in the study of gravitational waves and general relativity theory, said Sun Caihong, its deputy chief technologist. FAST's other tasks include exploration of interstellar molecules and communication signals, as well as building an accurate picture of the universe. "FAST is going to become central in developing a new map of our universe that is going to be used for all sorts of science. It will probably be many decades before a better map is created," said Marko Krco, a visiting U.S. astronomer at the NAOC. cheap custom wristbandsrubber wristbands24 hour braceletscustom silicone wristbandsballer bandssilicone fidget spinner
SINDHUDURG, India - The fishermen were dubious when ocean experts suggested they could save their dwindling marine stocks just by switching to new nets. It took years for the United Nations Development Program to convince the fishing communities along India's tropical western coast that the diamond-mesh nets they were using were trapping baby fish, while a square-shaped mesh could allow small fish to escape to maintain a breeding population. But two years after the new nets were fully adopted, fishermen insist they're making a difference. "This square net is a blessing for us," said John Gabriel Naronha, who runs six trawlers in the area. "When the small fish grows up, the fishermen can really benefit ... we can get good prices for big fish. And the small fish gets a chance to grow." The project, launched in 2011, is one of many being showcased at a major conference on oceans beginning on Monday, where the UN will plead with nations to help halt a global assault on marine life and ecosystems that is threatening jobs, economies and even human lives. "The oceans of the planet are in dire need of urgent action," said Marina Walter, deputy director for UNDP in India. That action is even more urgent now that climate change is causing ocean temperatures to rise while waters also become more acidic, causing widespread destruction of coral reefs that sustain a quarter of all marine species. The struggles of India's fishermen are hardly unique. About one out of every 10 people in the world relies directly on the ocean to survive. Most of those are among the world's poorest, meaning they have few substitutes when marine life declines. Meanwhile, the UNDP has also helped set up a crab farming project in the Sindudurg area to encourage local preservation of the mangroves and resistance to land developers and those gathering firewood from chopping the saltwater-tolerant trees down. Local officials are delighted with the low-fuss process and positive results. "With very little manipulation of the environment, you can grow crabs wherever you have mangroves," said N. Vasudevan, who heads a special unit for the government of India's western state of Maharashtra. Associated Press
