@ Racim Amr

The oldest estimated Earth rock is a zircon sample with an age of 4.404 ±0.008 billion years. A few things stand out about that. First, the age of the Earth is estimated to be about 4.54 ± 0.05 billion years old. That's less than 100 million years between Earth's genesis and the creation of that zircon sample. Second, the margin of error on the age of the zircon is 8 million years. That zircon is so old that that's the most precise guess at its age.

The Earth has changed so much, geologically speaking, that a contender for the oldest known rock made on Earth was actually found on the Moon. Lunar Sample 14321, aka Big Bertha, was collected during the Apollo 14 mission in 1971. In 2019 it was estimated at over 4 billion years old. This is a meteorite from Earth, back when our planet was still forming and was being impacted by massive asteroids. There may even be others older than Big Bertha on the Moon, possibly making it the best place to learn about the Hadean eon.

But you know what has me really fucked up? The oldest known rock on Earth isn't actually from Earth. The Murchison meteorite fell in Australia in 1969. Parts of it are estimated to be about 7 billion years old. Again, the age of the Earth is roughly 4.54 billion years old, meaning that this meteorite is 2.5 billion years older than Earth — older than the Solar System and the Sun, even. Our Solar System was just a large cloud of space dust when this meteorite was formed. It's that old.

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