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Earth lost 40% mass during formation

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Earth lost 40% mass during formation
Earth lost 40% mass during formation. IANS
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London, Sep 28: The violent and chaotic process that led to the formation of Earth resulted in the loss of more than 40 per cent of its mass, says a study.

Analysing a mixture of earth samples and meteorites, the scientists shed new light on the sequence of events that led to the creation of our home planet.

Planets grow by a process of accretion – a gradual accumulation of additional material – in which they collisionally combine with their neighbours.

This is often a chaotic process and material gets lost as well as gained, said the study published in the journal Nature.

Massive planetary bodies impacting at several kilometres per second can generate substantial heat which, in turn, produces magma oceans and temporary atmospheres of vaporised rock.

Repeated loss of this vapour envelope during continued collisional growth causes the planet’s composition to change substantially.

“We have provided evidence that such a sequence of events occurred in the formation of the Earth and Mars, using high precision measurements of their magnesium isotope compositions,” said lead researcher Remco Hin from University of Bristol in Britain.

“Magnesium isotope ratios change as a result of silicate vapour loss, which preferentially contains the lighter isotopes. In this way, we estimated that more than 40 per cent of the Earth’s mass was lost during its construction,” he said.

For the study, the researchers analysed samples of the Earth together with meteorites from Mars and the asteroid Vesta, using a new technique to get higher quality measurements of magnesium isotope ratios than previously obtained.

“We now show that vapour loss during the high energy collisions of planetary accretion has a profound effect on a planet’s composition,” Hin said.

“This process seems common to planet building in general, not just for Earth and Mars, but for all planets in our Solar System and probably beyond, but differences in the collision histories of planets will create a diversity in their compositions,” he added. (IANS)

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NASA On The Outlook To Find The Name Of Its New Mars Rover

Mars 2020 is targeted for launch in July or August 2020 from the Cape Canaveral Air Force Station in Florida.

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TESS, rover
NASA Curiosity rover completes 6 years on Mars. Pixabay

NASA is on the look out for a partner to conduct a contest among students to name the agency’s next rover to the Red Planet — the Mars 2020 mission — in the 2019 academic year.

The Mars 2020 rover mission addresses high-priority science goals for Mars, including key questions about the potential for life on the Red Planet.

Corporations, nonprofits and educational organisations interested in sponsoring the contest can send proposals to NASA.

Rover
The selected partner will have an opportunity to be part of a historic mission, NASA said. IANS

To be considered, all proposals must be received by October 9, NASA said in a statement on Friday.

“We’ve been doing naming contests since the very first Mars rover back in 1997,” said Thomas Zurbuchen, Associate Administrator for the Science Mission Directorate at NASA Headquarters, in Washington.

“Thousands of kids participate, and their enthusiasm for the contest and Mars is infectious,” Zurbuchen said.

TESS, rover
An artist’s concept provided by NASA shows the Keplar Spacecraft moving through space. VOA

The selected partner will have an opportunity to be part of a historic mission, NASA said.

Also Read: Balloon Mission by NASA May Lead to Improved Weather Forecasting

Mars 2020 is targeted for launch in July or August 2020 from the Cape Canaveral Air Force Station in Florida. (IANS)

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