Was Mars Stripped Of Its Protective Magnetic Field By A Huge Asteroid Impact

The Hellas basin on Mars was created by an asteroid impact so violent it left a crater as deep as Mount Everest is high - and deposited a layer of debris more than a mile thick around the crater

Was Mars Stripped Of Its Protective Magnetic Field By A Huge Asteroid Impact That Left THIS Crater As Deep As Mount Everest? -- Daily Mail

Four billion years ago, Mars had a magnetic field, just like Earth's - but something turned it off, leaving a barren planet totally exposed to the Sun's deadly radiation.

Now scientists have come up with a likely culprit - a huge asteroid impact which left a crater as deep as Mount Everest is high.

That impact, and four other 1500-mile-wide asteroids, had a catastrophic effect on hot rocks in and under Mars's surface - 'knocking out' the planet's magnetic field forever.

Read more ....