Asteroid fragments may provide glimpse into origins of planets



Asteroid fragments may provide glimpse into origins of planets Washington: The Japanese mission Hayabusa has captured tiny pieces of rock – at 50-100 micrometers smaller than a human hair –from asteroid Itokawa.

And experts hope that analysis of the rocks will provide a glimpse into the early history of the Solar System and the formation of the planets more than 4.5 billion years ago.

It is the first time samples from an asteroid have been returned to Earth.

Only about 70 samples have been released for international analysis – seven of these are being studied at the University’s School of Earth, Atmospheric and Environmental Sciences

The Hayabusa mission is part of a continuing effort to understand how asteroids, which are leftovers from the formation of planets like Earth, formed and evolved. It recovered fragments from the 500 metre-long asteroid Itokawa in 2005 and returned them to Earth in 2010.

Itokawa is only the third planetary body from which samples have been returned to Earth, after Apollo/Luna samples from the Moon and ‘Stardust’ samples from comet Wild 2. All of these have been analysed at The University of Manchester.

Just 11 international scientific teams have been selected to analyse these precious samples.

The team, led by Dr Henner Busemann of the University’s School of Earth, Atmospheric and Environmental Sciences, includes researchers from Germany, Sweden and Switzerland. It was selected because of two unique devices for analysing the samples – Manchester hosts the most sensitive system in the world for analysing the rare gases xenon and krypton.

The team hopes to find out how rapidly, and by what processes, the asteroid’s surface is being changed and whether asteroids like Itokawa could have delivered material to the Earth early in its history.

“Meteorites are samples of asteroids that fall to Earth, and we’ve learnt a lot by studying them,” Dr Busemann said.

“However, these grains are unique because we know which of the millions of asteroids they came from and they haven’t been exposed to the Earth’s environment. We stand to learn a huge amount about how asteroids formed and evolved,” the researcher added.

ANI