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Asked by abys532pact4 on 10 Oct 2025.
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David Taylor answered on 10 Oct 2025:
Great question. The Earth is only a little bit younger than the sun (both formed about 4.5 billion years ago). When a star is forming it collects material from a disc around it, and planets form from that disc. We know that exoplanets must take around 30 million years to form (since these discs only live for around that time), so I’d say the Earth will have taken about that time to form.
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Emily Walls answered on 10 Oct 2025:
I believe that Earth formed around 4.5 billion years ago, it was formed using left over resources from the production of the Sun!
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Martin McCoustra answered on 13 Oct 2025:
Our star and planetary system were formed around 4.5 billion years ago from a massive cloud of gas and icy dust. We can see analogues of this happening now if we look out into space. To go from the gas cloud to what is called a proto-planetary disk takes something like 10 million years. By the time Earth was around 300 million years old, life had evolved.
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Comments
Pete Webb commented on :
The Earth came together as a more or less solid planet 4.5 billion years ago. However, it’s still forming! Plate tectonic movement of the continents, volcanoes and earthquakes all tell us that the Earth is still settling down, still in a state of motion, with all the mineral compounds in the core, mantle and crust still moving around to try and find equilibrium. So in that way you can say that the Earth is still forming, and that’s likely to continue for millions of years into the future.