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However, scientists can look at the decay of other elements in these objects allowing them to date them up to 2.2 billion years.

These dating techniques are by no means perfect, but they are always improving, and they are the best methods that we have at this time.

Radiometric dating (often called radioactive dating) is a way to find out how old something is.

The method compares the amount of a naturally occurring radioactive isotope and its decay products, in samples. It is the main way to learn the age of rocks and other geological features, including the age of the Earth itself.

[See Periodic Table of the Elements] Carbon occurs naturally as carbon-12, which makes up almost 99 percent of the carbon in the universe; carbon-13, which makes up about 1 percent; and carbon-14, which makes up a minuscule amount of overall carbon but is very important in dating organic objects.

As the sixth-most abundant element in the universe, carbon forms in the belly of stars in a reaction called the triple-alpha process, according to the Swinburne Center for Astrophysics and Supercomputing.

In older stars that have burned most of their hydrogen, leftover helium accumulates.

Anything which changes the relative amounts of the two isotopes (original and daughter) must be noted, and avoided if possible.Radiometric dating is also used to date archaeological materials, including ancient artifacts.Radiometric dating methods are used to establish the geological time scale.Radiocarbon Dating One method that scientists use to date ancient fossils and artifacts is called radiocarbon dating.All living things on Earth are made up of a high percentage of an element called carbon.

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