Of course, it’s not a coincidence; the Sun and the planets all formed together from a diffuse cloud of hydrogen billions of years ago.In the early Solar System, all of the planets formed in the solar nebula; the remnants left over from the formation of the Sun.Spurred by this suggestion, Georges Louis Leclerc (Comte de Buffon) conducted a series of experiments in which he measured how long it took for iron balls glowing red hot to cool to approximately room temperature.
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At some point in the early history of Earth, a planetoid the size of Mars crashed into our planet.
The resulting collision sent debris into orbit that eventually became the Moon.
The best estimates of the age of the Earth are calculated from the ratios of lead and uranium in meteorites found on Earth.
These estimates are verified by Sir Isaac Newton speculated that because "comets occasionally hit the Sun", perhaps the Earth formed from the scattered debris and as such began in a molten state and has been cooling ever since.
Earlier research had shown that isotopes of some radioactive elements decay into other elements at rates that can be easily predicted.
By examining the existing elements, scientists can calculate the initial quantity, and thus how long it took for the elements to decay, allowing them to determine the age of the rock.
How do scientists know Earth is 4.54 billion years old?
It’s actually difficult to tell from the surface of the planet alone, since plate tectonics constantly reshape its surface.
Prior to 1905 the best and most accepted age of the Earth was that proposed by Lord Kelvin based on the amount of time necessary for the Earth to cool to its present temperature from a completely liquid state.