|When was Earth made?|
The Earth was made about four and half
billion years ago, along with the rest of the
solar system. The whole solar system used to be
just a cloud of matter (mostly hydrogen), which
collapsed under its own gravity. A bunch of the
hydrogen gas collapsed to form a star, which is
our sun; the rockier junk stayed in orbit around
the sun, and over time that junk collided with
itself over and over again until it formed the
rocky planets, including the Earth. In fact, we
think that this is how pretty much all planetary
The Earth is 4, 568,000,000 years old. And
you thought your dad or grandpa was old!
Our solar system formed between 4.7 and 4.5
billion years ago. This number is taken from the
ages of meteorites, because we can determine the
ages of individual rocks. No rocks on Earth are
more than about 4.0 or 4.1 billion years old
(apart from meteorites that have fallen to
Earth, that is); however, geologic processes on
Earth tend to destroy rocks and so rocks even
4.0 billion years old are very, very, rare. It
is generally thought that the Earth is about as
old as the rest of the solar system, but that
the rocks on Earth older than 4.0 billion have
been destroyed by erosion, melting, etc.
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