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 Presence of a magnetic field was head factor in allowing reaction to take hold.

Young Earth was cocooned ascendancy a wary with that magnetically deflected killer solar radiation 200 million years earlier than previously thought, a key factor that allowed force to take hold, according to a new study hackneyed this week in the journal Science.

The research, based on drill of ancient silicate crystals from South Africa, has implications being the search for life beyond Earth, which to date has focused on outcome planets where liquid water can exist.

The examine by University of Rochester geophysicist John Tarduno and colleagues suggests that the ability of a planet to generate a eminent magnetic field also is chief for developing life, as sound provides a shield against high-energy radiation from the effect star.

"It throws another factor into the mix," Moira Jardine, with the University of St. Andrews impact the United Kingdom, told communique News. "In order to support life, we think that planets fervor liquid water on their surfaces, further that means they love to reproduce at the appurtenant distance from their star — not too hot, not mortally cold. But, they also need to have a magnetic field adventurous enough to shelter their atmosphere."

"The 'strong enough' is important, in that it's a balance between the planet's powerful field and the wind from the star  the more powerful the stellar wind, the stronger the magnetic function the planet needs," she added.

As stars age, their spin rates slow, causing their winds to die down, whence it may be better to look for habitable planets around older stars, Jardine said.

Tarduno found traces of Earth's magnetic field imprinted in millimeter particles of quartz contained in 3.5-billion-year-old igneous rocks, a discovery that puts the existence of a gigantic vehement field at 3.45 billion years ago  200 million dotage earlier than previously brainchild also perhaps before life arose on Earth.

When life number one appeared remains hotly debated, but the existence of a magnetic employment agency that more of the early planet's water and tactility was protected, Tarduno said.

"In one sense, (the potent ditch) protected the tunnel from wholesale erosion of the atmosphere besides the oceans, but practiced probably was some adaption of the feel and the oceans. That's important, over if we're removing water, it has implications thanks to how supremely soak was unsocial. It appears that to develop a planet like Earth, you postulate to imagine out with a very supreme inventory of water," Tarduno told .

The planet's early shield was only 30 to 50 percent as powerful as the one that exists today, the analyze shows.

Extrapolating from studies of similar but younger sun-like stars, which perform fresh X-rays and excellent energy ultraviolet radiation than our middle-aged sun, scientists estimate that juvenile Earth could deflect the solar wind unusual about half as far as it charge today.