Ancient rocks hold proof of Earth's magnetic field. Here's why that's puzzling
Earth's ancient magnetic field appears to have had a strength similar to what we see today, and it may have protected ancient life from harmful cosmic radiation.
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Earth's ancient magnetic field appears to have had a strength similar to what we see today, and it may have protected ancient life from harmful cosmic radiation.
We might already have gathered the data that could tell us whether aliens exist on Mars
We might already have gathered the data that could tell us whether aliens exist on Mars
We might already have gathered the data that could tell us whether aliens exist on Mars
A new study analyzing fragments of the planet's oldest ancient rocks offers some of the clearest evidence yet that the Earth's crust was pushing and tugging in a way comparable to present plate tectonics at least 3.25 billion years ago.