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Supernova gives glimpse of creation of life

world Updated: Dec 16, 2011 00:44 IST
Ian Sample

The spectacular explosion of a star in a distant galaxy has given astronomers a rare glimpse of how supernovae blast the basic ingredients for life into the cosmos.

Scientists captured images of the colossal detonation in the Pinwheel galaxy 21 million light years away within hours of the burst of light from the explosion reaching Earth.

The supernova, called SN2011fe, was the result of a thermonuclear explosion that tore the parent star apart, converting carbon and oxygen into heavier elements, such as nickel, in the process.

Nasa’s Swift space telescope turned its sensors towards the exploding star moments after observations began at three powerful ground-based telescopes. “We caught the supernova just 11 hours after it exploded, so soon that we were later able to calculate the actual moment of the explosion,” said Peter Nugent at the US department of energy’s Berkeley Lab in California.

Watching the star explode gave scientists a unique insight into how elements created in the supernova spewed out into space in the expanding fireball. The telescopes recorded oxygen, magnesium, silicon, calcium and iron being flung out at 16,000 kilometres a second, around 5% of the speed of light.

“Understanding how these giant explosions create and mix materials is important because supernovae are where we get most of the elements that make up the Earth and even our own bodies. For instance, these supernovae are a major source of iron in the universe. So we are all made of bits of exploding stars,” said Mark Sullivan at Oxford University.

The observations gave scientists fresh details of what triggers this class of stellar explosion, known as a type 1a supernova. This kind of supernova is important because it always produces the same amount of light. Monitoring their brightness has allowed astronomers to calculate the rate of expansion of the universe. gns