Radiometric dating of sedimentary rocks is unreliable because Sexchat anonima
Some of the earliest forms of life have been found in Western Australia, as announced in a 2018 study; the researchers found tiny filaments in 3.4-billion-year-old rocks that could be fossils.
Other studies suggest that life originated even earlier.
Samples of the meteorite show a spread from 4.53 billion to 4.58 billion years.
Scientists interpret this range as the time it took for the solar system to evolve, a gradual event that took place over approximately 50 million years.
By examining the existing elements, scientists can calculate the initial quantity of a radioactive element, and thus how long it took for the elements to decay, allowing them to determine the age of the rock.
Plate tectonics then threw the crushed rock back into the interior of the Earth, removing the old evidence and turning it into new rock.Gravitational interactions coalesced this material into the planets and moons at about the same time.By studying other bodies in the solar system, scientists are able to find out more about the early history of the planet.Although no rocks have been deliberately returned from Mars, samples exist in the form of meteorites that fell to Earth long ago, allowing scientists to make approximations about the age of rocks on the Red Planet.Some of these samples have been dated to 4.5 billion years old, supporting other calculations of the date of early planetary formation.