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WASHINGTON, July 5 (Xinhua) -- The countdown for the final space shuttle launch began Tuesday afternoon, but unfavorable weather may delay shuttle Atlantis' launch attempt on Friday, NASA announced."We are going with a 60 percent chance of KSC (Kennedy Space Center) weather prohibiting launch due to the potential for showers and isolated thunderstorms in the area," shuttle weather officer Kathy Winters told reporters Tuesday at a precountdown status briefing. "I wish I had a better weather briefing for you."Atlantis is scheduled to lift off at 11:26 am (1526 GMT) on Friday from Kennedy Space Center with four U.S. astronauts on board for a 12-day mission to the International Space Station. Overall, the chance of an on-time liftoff is 40 percent, Winters said."We will do everything we can to launch on Friday but if things don't work out so that we can do that we have plenty of options... Saturday and Sunday," said NASA Test Director Jeremy Graeber. Conditions improve for Atlantis launch opportunities on Saturday and Sunday.NASA said it must launch Atlantis by Sunday, otherwise it will have to wait until at least July 16. That's because of an unmanned rocket due to lift off next week, using the same launch support personnel and equipment.NASA's 30-year-old shuttle program is ending due to high operating costs. The Obama administration wants to spur private companies to get into the space taxi business, freeing NASA to focus on deep space exploration and new technology development.When the U.S. space shuttle program officially ends later this year, the Russian space program's Soyuz capsule will be the only method for transporting astronauts to and from the station.

JIANGYIN, Jiangsu, July 1 (Xinhua) -- China's manned deep-diving submersible, the Jiaolong, embarked on a journey on Friday during which it will make a 5,000-meter dive in the Pacific Ocean.During the dive, the submersible will undergo several operational tests in which it will take photos, shoot video, survey seabeds and take samples from the ocean floor, according to Jin Jiancai, deputy director of the submersible's diving test program team.The tests will be conducted in the Pacific Ocean in accordance with a contract signed between the China Ocean Mineral Resources Research & Development Association and the International Seabed Authority (ISA).The submersible is scheduled to spend 47 days at sea, according to a statement from the Ministry of Science and Technology.A submersible differs from a submarine, as it typically depends on another vessel or facility for support.The Jiaolong, designed to reach a depth of 7,000 meters, completed 17 dives in the South China Sea between May 31 and July 18 last year, reaching 3,759 meters during its deepest dive.In the year since the submersible's last dive, program team members have made several technical improvements to the submersible and its support vessel, Jin said.Jin said the program team members are "very confident" about the test.He also stressed that the test will be carried out in accordance with the provisions of the United Nations Convention on the Law of the Sea as well as the ISA's rules and regulations.The Jiaolong is the world's first manned submersible designed to reach depths of 7,000 meters below sea level, according to Xu Qinan, the submersible's chief designer.

WASHINGTON, Sept. 14 (Xinhua) -- The U.S. space agency NASA unveiled plans on Wednesday for a deep space rocket to carry astronauts to the moon, Mars and other destinations beyond the International Space Station.The Space Launch System, or SLS, will be designed to carry the Orion Multipurpose Crew Vehicle, as well as important cargo, equipment and science experiments to Earth's orbit and destinations beyond. Additionally, the SLS will serve as a backup for commercial and international partner transportation services to the International Space Station."This launch system will create good-paying American jobs, ensure continued U.S. leadership in space, and inspire millions around the world," NASA Administrator Charles Bolden said in a statement. "President Obama challenged us to be bold and dream big, and that's exactly what we are doing at NASA. While I was proud to fly on the space shuttle, kids today can now dream of one day walking on Mars."The SLS rocket will incorporate technological investments from the Space Shuttle program and the Constellation program in order to take advantage of proven hardware and cutting-edge tooling and manufacturing technology that will significantly reduce development and operations costs.The first developmental flight, or mission, is targeted for the end of 2017, according to NASA.

SAN FRANCISCO, Sept. 6 (Xinhua)-- Yahoo on Tuesday fired Chief Executive Officer Carol Bartz and replaced her temporarily with the company's chief financial officer."On behalf of the entire board, I want to thank Carol for her service to Yahoo during a critical time of transition in the company's history, and against a very challenging macro-economic backdrop," said Yahoo Chairman Roy Bostock in a news release.The Yahoo Board of Directors appointed CFO Timothy Morse as interim CEO who will manage the company's day-to-day operations until a permanent chief executive is chosen.Carol Bartz, chief executive of Internet company Yahoo Inc, is shown in this undated publicity photo released to Reuters January 13, 2009. Before Yahoo's formal announcement, several news organizations and tech blogs posted an email reportedly from Bartz sent from her iPad to all employees of the company."To all, I am very sad to tell you that I've just been fired over the phone by Yahoo's Chairman of the Board. It has been my pleasure to work with all of you and I wish you only the best going forward."Bartz, 63, took over the Yahoo CEO role from co-founder Jerry Young in January 2009, when the company was struggling to stay competitive and profitable in a market dominated by Google. However, Yahoo never reached the heights she had foreseen.In the most recent quarterly earnings report in June, Yahoo reported net revenue of 1.1 billion U.S. dollars, down 5 percent from last year.Morse, 42, was hired as executive vice president and CFO at Yahoo in July 2009. "It is an honor to be selected for this role," he said in a statement Tuesday.Yahoo said it is starting a search for a new permanent CEO and plans to hire a "nationally recognized executive search firm" to assist in the effort.