We have rocks from the Moon (brought back), meteorites, and rocks that we know came from Mars.

how are half life and radiocarbon dating used by scientists-78

K9 sex forum - How are half life and radiocarbon dating used by scientists

Atoms of carbon-14 are produced in the atmosphere by neutron bombardment of atoms of nitrogen-14.

The carbon-14 so produced decays by β-decay back into nitrogen-14.

Libby thus reasoned that by measuring carbon 14 levels in the remains of an organism that died long ago, one could estimate the time of its death.

This procedure of radiocarbon dating has been widely adopted and is considered accurate enough for practical use to study remains up to 50,000 years old.

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The evolutionary scientists themselves have never said that carbon-dating has been used on fossils; so why do people in the media and on the street think that they have? Carbon exists in a number of different types, called isotopes, which have different masses, depending on the number of neutrons in the nucleus.

In carbon, the main isotopes have mass numbers of 12, 13 and 14 respectively.

These are the surfaces that we can get absolute ages for.