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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’s Planet-Hunting Telescope Lifts Off In U.S.

Rocket with planet-hunting telescope finally lifts off

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NASA's next mission.
TESS, the Transiting Exoplanet Survey Satellite, is shown in this conceptual illustration obtained by Reuters on March 28, 2018. NASA sent TESS into orbit from the Kennedy Space Center in Florida aboard a SpaceX Falcon 9 rocket April 18, 2018, on a two-year mission. VOA

A Falcon 9 rocket blasted off Wednesday carrying SpaceX’s first high-priority science mission for NASA, a planet-hunting space telescope whose launch had been delayed for two days by a rocket-guidance glitch.

The Transit Exoplanet Survey Satellite, or TESS, lifted off from Florida’s Cape Canaveral Air Force Station at 6:51 p.m. EDT, starting the clock on a two-year quest to detect more worlds circling stars beyond our solar system that might harbor life.

The main-stage booster successfully separated from the upper stage of the rocket and headed back to Earth on a self-guided return flight to an unmanned landing vessel floating in the Atlantic.

Also Read: Why NASA sent human sperm to space?

The first stage, which can be recycled for future flights, then landed safely on the ocean platform, according to SpaceX launch team announcers on NASA TV.

Liftoff followed a postponement forced by a technical glitch in the rocket’s guidance-control system.  VOA

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