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SPACE TRAVEL
US spacecraft enters giant asteroid's orbit
by Staff Writers
Washington (AFP) July 17, 2011


The US spacecraft Dawn has entered the orbit of Vesta, one of the largest asteroids in the solar system, the US space agency announced early Sunday.

Dawn is expected to come within 10,000 miles (16,000 kilometers) of Vesta to study its surface while traveling 116 million miles (188 million kilometers) from Earth.

"It has taken nearly four years to get to this point," said Robert Mase, manager of the $466 million project at NASA's Jet Propulsion Laboratory in Pasadena, California.

After a year of observations and measurements around Vesta, Dawn will depart for its second destination, the dwarf planet Ceres, in July 2012. It will be the first craft to orbit two solar system destinations beyond Earth, said NASA officials.

The foremost objective of Dawn's eight-year mission is to compare and contrast the two giant bodies, which NASA says will help scientists "unlock the secrets of our solar system's early history."

"Dawn's science instrument suite will measure surface composition, topography and texture. In addition, the Dawn spacecraft will measure the tug of gravity from Vesta and Ceres to learn more about their internal structures," NASA said in a press release.

The spacecraft, which was launched in 2007, has a gamma ray and neutron detector instrument, which will gather information on cosmic rays during the approach phase, as well as an infrared mapping spectrometer.

The mission, which can be followed on NASA's website at http://dawn.jpl.nasa.gov, comes as a far more famous space craft, the shuttle Atlantis, orbits the Earth on the final mission of the 30-year shuttle program.

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