SciShow: how old is Earth and how did we measure its age?


The age of the Earth is one of the cornerstones of the 19th century. Lord Kelvin, yes, that guy, was obsessed with this question and he obtained several hundreds of millions of years. The conservative world of that time, a world which relied on religion way too much, believes that the Earth was only a measly 6000 years old. Why would you challenge such a thing?

Well, the search for truth gets you in the darkest corners of the Earth and in the deepest valleys of the Solar System. First, we now know that the Earth is 4.54 billion years old and we found out about this age through radioactive decay dating.

We were to the Moon and brought back some pieces of the Moon and then compared those with the ones we found when meteorites fell out of the sky. The ages mach. Measuring how much Uranium has decayed over the eons we could set the time to 4.54 billions years back.

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