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Life on Earth: why we may have the Moon’s now defunct magnetic field to thank for it – The Conversation UK

The Earth’s magnetic field was most likely weaker when life evolved on our planet than it is today.

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The habitability of a planet depends on many factors. One is the existence of a strong and long-lived magnetic field. These fields are generated thousands of kilometres below the planets surface in its liquid core and extend far into space shielding the atmosphere from harmful solar radiation.
Without a strong magnetic field, a planet struggles to hang on to a breathable atmosphere which is bad news for life as we know it. A new study, published in Science Advances, suggests that the Moons now …

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