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Increasingly, the other techniques are used, such that probably no one technique dominates for meteorite dating.

Rb-Sr is a good example for explaining the process, however.

The full Moon on March 19, 2011 coincided with the Moon being at its orbital perigee, an uncommon coincidence that made it appear (slightly) larger and brighter than most full Moons.

Only the latter two "extinct" nuclides are used in dating.

After the second half-life has elapsed, yet another 50% of the remaining parent isotope will decay into daughter isotopes, and so on.

For all practical purposes, the original isotope is considered extinct after 6 half-life intervals. A small portion of a meteorite is vaporized in the device forming ions.

Thus, although "extinct", these nuclides are present in meteorites, but produced by a more recent process.

"The idea that Rb-Sr is the most used chronometer for meteorites is largely based on work done 10-30 years ago.

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