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A Long March-4B rocket carrying X-ray space telescope to observe black holes cheap nike air max 90 floral , pulsars and gamma-ray bursts blasts off from Jiuquan Satellite Launch Center in northwest China's Gobi Desert, June 15, 2017. (XinhuaZhen Zhe)

JIUQUAN, June 15 (Xinhua) -- China launched its first X-ray space telescope to observe black holes, pulsars and gamma-ray bursts, via a Long March-4B rocket from Jiuquan Satellite Launch Center in northwest China's Gobi Desert at 11 a.m. Thursday.

The 2.5-tonne Hard X-ray Modulation Telescope (HXMT) cheap nike air max 90 womens , dubbed Insight, was sent into an orbit of 550 kilometers above the earth to help scientists better understand the evolution of black holes, and the strong magnetic fields and the interiors of pulsars.

Through the telescope, scientists will also study how to use pulsars for spacecraft navigation, and search for gamma-ray bursts corresponding to gravitational waves.

The result of the wisdom and efforts of several generations of Chinese scientists, Insight is expected to push forward the development of space astronomy and improve space X-ray detection technology in China.

Insight can be regarded as a small observatory in space cheap nike air max 90 retro , as it carries a trio of detectors -- the high energy X-ray telescope (HE), the medium energy X-ray telescope (ME) and the low energy X-ray telescope (LE) -- that cover a broad energy band from 1 keV to 250 keV, said Lu Fangjun, chief designer of the payload.

Based on the demodulation technique first proposed by Li Tipei, an academician of the Chinese Academy of Sciences (CAS), in 1993 cheap nike air max 90 mens , the HE has a total detection area of more than 5,000 square centimeters, the world's largest in its energy band.

"Given it has a larger detection area than other X-ray probes, HXMT can identify more features of known sources," said Xiong Shaolin, a scientist at the Institute of High Energy Physics of the CAS.

Chen Yong cheap nike air max 90 br , chief designer of the LE, said X-rays of lower energy usually have more photons, so a telescope based on a focusing technique is not suitable for observing very bright objects emitting soft X-rays, as too many photons at a time will result in over-exposure.

But HXMT won't have that problem, as its collimators diffuse photons instead of focusing them. "No matter how bright the sources are, our telescope won't be blinded cheap nike air max 90 sneakerboot ," said Chen.

According to Zhang Shuangnan, HXMT lead scientist, the satellite's developers found that a set of HXMT high-energy detectors, originally designed to shield background noises caused by unwanted particles, could be adjusted to observe gamma-ray bursts.

The creative new function pushes the satellite's observation band up to 3 MeV and a very good energy spectrum, Zhang said.

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WASHINGTON, July 2 (Xinhua) -- An all-clear was given after no evidence was found about the earlier reported shootings at the U.S. Navy Yard in Washington D.C., the site of a rampage taking place in September 2013, said authorities Thursday.

""Right now the evidence is that there was no criminal acts here. No shots were fired,"" said D.C. Police Chief Cathy Lanier at a briefing, adding authorities didn't believe the report of the shooting was a hoax.

According to the police cheap nike air max 90 glow , a call was made from a building inside the naval installation about possible sounds of gunshots about 7: 30 a.m. EDT. Massive police units were present at the scene after the call and a lockdown order was imposed on the navy base.

The building in question was the same one where Aaron Alexis, a former sailor who was working at the Navy Yard, gunned down 12 civilian workers in a shooting spree in 2013.

""An employee thought they heard something of concern, they made a call,"" said Lanier.

Thursday's false alarm came at a time when law enforcement around the country was beefing up security measures in preparation for the coming July 4 Independence Day weekend as warnings of possible domestic attacks tied to the extremist group the Islamic State (IS) were issued by the authorities.

After a series of deadly attacks on Friday killed more than 60 people in France, Tunisia and Kuwait with strong indication of the involvement of the IS in each incident cheap nike air max 90 off white , concerns were raised that attacks would also happen in the United States during the forthcoming holiday weekend.

Although U.S. intelligence officials initially said that no evidence indicated coordination among the three overseas incidents, they noted that multiple factors may have inspired those attacks, including a recent statement by the IS, which called on followers to launch attacks at the group's enemies during the month of Ramadan.

The Federal Bureau of Investigation (FBI) and the Department of Homeland Security (DHS) last week sent a bulletin to local law enforcement to step up security over the July 4 weekend. Though not mentioning a specific plot, the bulletin said that alertness should be elevated around Independence Day in case of an attack centered on the holiday.

The Pentagon on Wednesday joined FBI and DHS in issuing its own warning of potential ""lone-wolf"" attacks by IS supporters during the holiday weekend.


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