Four times in the past 18 months, China has carried out hypersonic (极超音速的) weapons tests. Hypersonic weapon delivery vehicles can travel at speeds of more than five times the speed of sound. China says its most recent test flight was on June 9th. The tests are a sign of the country's continuing efforts to make highly developed weapons.
The hypersonic missile delivery vehicles are able to transport nuclear weapons. But China said the tests are, in its words, "purely scientific and (are) not targeted at any country."
The United States, Russia and India have also been developing hypersonic vehicles.
One of China's four tests reportedly failed. And the United States is far ahead of the Chinese in missile development. But China is developing hypersonic capability and could one day have better delivery vehicles than the United States. So says James Acton of the Nuclear Policy Program for International Peace. He spoke recently to members of the U.S. Congress.
Mr. Acton said China's hypersonic weapons development program is probably less developed than the American program. But he said China might be able to develop its program more quickly.
The U.S. military has been testing hypersonic weapon delivery vehicles for the past five years. The military completed a fourth successful test two years ago. Some experts say hypersonic glide vehicles could be available for use by the armed forces within five to 10 years.
In recent years, U.S. lawmakers expressed concern about China's development of hypersonic technologies. Some said that the United States is falling behind China in the hypersonic arms race.
American officials hope the United States can keep its lead in being able to launch targeted missile strikes quickly. They say such a lead can persuade possible enemies from launching attacks.
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