Today's Edition
XICHANG, CHINA (AFP)
A French-Chinese satellite blasted off Saturday on a hunt for the mightiest explosions in the universe.
Developed by engineers from both countries, the Space Variable Objects Monitor (SVOM) is carrying four instruments -- two French, two Chinese -- that will seek out gamma-ray bursts, the light from which has travelled billions of light years to reach Earth.
The 930-kilogram (2,050-pound) satellite "successfully" took off around 3:00 pm (0700 GMT) aboard a Chinese Long March 2-C rocket from a space base in Xichang, in southwestern Sichuan province, China's National Space Administration said.
Gamma-ray bursts generally occur after the explosion of huge stars, those more than 20 times as big as the sun.
The extremely bright cosmic beams can give off a blast of energy equivalent to more than a billion billion suns.
Observing them is like "looking back in time, as the light from these objects takes a long time to reach us", Ore Gottlieb, an astrophysicist at the Flatiron Institute's Center for Astrophysics in New York, told AFP.
'Several mysteries'
The rays carry traces of the gas clouds and galaxies they pass through on their journey through space, valuable data for a better understanding of the history and evolution of the universe.
"SVOM has the potential to unravel several mysteries in the field of (gamma-ray bursts), including detecting the most distant GRBs in the universe, which correspond to the earliest GRBs," Gottlieb said.
"We are... interested in gamma-ray bursts for their own sake because they are very extreme cosmic explosions which allow us to better understand the death of certain stars," said Frederic Daigne, an astrophysicist at the Paris Institute of Astrophysics.
"All of this data makes it possible to test the laws of physics with phenomena that are impossible to reproduce in the laboratory on Earth."
Once analysed, the data could help to improve understanding of the composition of space and the dynamics of gas clouds or other galaxies.
The project stems from a partnership between the French and Chinese space agencies as well as other scientific and technical groups from both nations.
"It's a great success. We've managed to work well with our Chinese colleagues," Philippe Baptiste, CEO of France's CNES space agency, told AFP after the launch.
Once in orbit 625 kilometres (388 miles) above the Earth, the satellite will send its data back to observatories.
The main challenge is that gamma-ray bursts are extremely brief, leaving scientists in a race against time to gather information.
Once it detects a burst, SVOM will alert a team on duty around the clock.
Within five minutes, they will have to rev up a network of telescopes on the ground that will align precisely with the axis of the burst's source to make more detailed observations.
