Came across a (https://www.youtube.com/watch?v=g6thUIR3_rI) which describes Earth’s magnetic field having switched hundreds if not thousands of times during Earth’s 4.5 billion years.
So, how do we know thats a fact? What are scientists looking at that helped them determine this?
In: 2148
Side note – currently reading this book
[Sunfall by Jim Al-Khalili](https://www.goodreads.com/book/show/32603487-sunfall)
Written by a highly respected scientist in the Uk – set in near future where Earths magnetic field fails. Based on solid science. Entertaining in its own right but totally based on this subject
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